What $100 Buys in...San Miguel de Allende

Instead of packing a complete shaving kit, my husband fills his wide-mouth Nalgene water bottle with items such as razors, spare contact lenses, eyeglasses, toothbrush, and so on. This turned out to be particularly useful on our trip to Costa Rica, where we also took the bottle on our day hikes to volcanoes and the jungle.

Here's an important tip for cruising in winter: Fly into the port a day or two before your ship is scheduled to depart. We booked a Costa Rican cruise but were stuck in New York, where all flights out of JFK airport were canceled. Itineraries that include stops in places with airports can allow people to catch up. Ours didn't.

Once we know where we're going, my girlfriends and I divide up the list of things we'd like to do on our trip and put someone in charge of each item on the list. Then that person does the legwork by finding directions and prices, making reservations (if necessary), and researching nearby places to stop for a snack or a meal. Our method means that no one person is doing all the planning.

Before I visit poorer countries, I pop into a thrift store and pick up some toys, stuffed animals, and an old suitcase or carryall. I try to avoid toys like Easter bunnies or Santas, which could be offensive, and expensive things that might embarrass parents. The contents of my extra bag bring joy to countless kids who have never had a thing.

Ask your flight attendants for dining, lodging, shopping, and sightseeing advice. Most crews have up to the minute information gleaned from layovers, which they're more than happy to share with passengers. You can count on flight attendants to seek out budget treasures. I know—I've been married to one for more than 21 years!

My husband and I keep the stretchy slipper-socks that some airlines provide. (We've gotten them on Virgin Atlantic in economy class and on almost all airlines in business class.) They're great to use when packing shoes: Just slip each shoe into a sock, and you'll prevent clothes from getting marked up by the soles. As a bonus, you'll have slippers to wear when you're away from home. The socks are machine-washable and can last for many years.

The magnets you use on a refrigerator will also stick well to most hotel and motel room doors, turning them into makeshift bulletin boards. Post theater tickets, itineraries, reminder notes, and any other useful information, then grab what you need before you leave the room for the day.

Our bags have been stolen twice from inside locked rental cars. Now we travel with a bicycle cable and lock. If we absolutely have to leave our suitcases in the car, I hook them together by the handles and attach the whole thing to the frame of a seat or a secure item in the trunk. Even if thieves manage to get into our car, the cable will make it very difficult for them to make off with the luggage.

If you can't sleep due to the heat in your non-air-conditioned hotel room, take a cold bottle of water and place it on your pillow, in the crook of your neck. It will cool your whole body down.

Consider asking your driver or tour guide to haggle on your behalf at bazaars and souks. (But don't let them lead you to places where they might have a connection to the shopkeeper.) The money you tip them will usually be less than the markup on prices for tourists.

Don't put your magnetic sunglass clip-ons in the same pocket as your mass transit fare cards or hotel key cards. I managed to erase both my subway pass and my hotel key on a recent trip.

While traveling abroad, I've frequently encountered some appallingly bad (and often very funny) English translations of menus. In those cases, I simply offered to clean up the translations in exchange for a meal. This has worked quite a few times.

I always take a digital picture of the gas gauge to prove that I returned the rental car with a full tank. Some agencies try to charge for a minimal amount of gas when they "top off" the tank (which you're not supposed to do anyway). I've used these digital photographs to get refunds for gas charges that appeared on my credit-card bill after the fact.

I teach a Tulane University seminar on independent European travel for first-timers. Until recently, I advocated Europe's great rail networks as the way to go. Now, with the plethora of budget airlines, I recommend a combination of the two. But it makes the planning stage—which I find almost as much fun as actually taking the trip—more involved. Thank goodness for whichbudget.com, a Web site that lists, by city, which budget airlines serve which cities. Then, to find links to all of Europe's state railway Web sites, visit railfaneurope.net. Each site generally features a travel planner and, almost invariably, an English-language option.

My husband and I create personal cards (like business cards) before we leave home. We put our name, address, phone, and email address on them, as well as a picture of us. How many people have gotten home from a trip, looked at a slip of paper with a name and address, and wondered, Who is this? The picture helps link a name to a face.

I use an inexpensive, thumb-size USB flash drive to store medical and insurance contacts, confirmation codes, credit card numbers, addresses, and phone numbers. It fits in a secure zip pocket in my travel purse. If I don't have my laptop, I can insert the flash drive in most hotel or Internet café computers. Some USB flash drives password-protect your data, or you can download a free encryption program.

Instead of dropping my laundry off at the front desk, I take a walk around the block and look for the nearest dry cleaner--probably the same one the hotel would've taken it to. By cutting out the middle man, I pay a quarter of what they charge at the hotel!

Remember to check the hours of operation for your hotel's airport shuttle. In Rome,we were surprised to learn that our hotel--which touted its shuttle--only offered the service a few hours a day.

Whenever I know I'll be renting a car, I pack a couple of folded paper towels and two small spray bottles--one filled with window cleaner and the other with Rain-X, a product that repels raindrops. It's hard enough driving an unfamiliar car in an unfamiliar location. At least with a clean windshield I'm able to see properly, no matter the weather.

Carry a twist tie in your wallet. Among other ingenious uses, a twist tie can temporarily replace a lost screw on a pair of glasses. Just peel the paper or plastic off the tie so you have bare wire, insert it where the screw once was, and twist to tighten. Unlike Scotch tape or a safety pin, a twist tie is small enough to remain hidden and strong enough to hold until you're able to replace the screw.

If your tablecloth is wet at dinner, you should prepare for rough seas. Restaurant staffers have been known to slightly dampen the tablecloth to keep plates and glasses from sliding.

I'm a gadget freak, and I don't like to travel without things like my digital camera and iPod. On one trip, though, I put my camera down in a crowded restaurant and then forgot to put it back in my bag. By the time I remembered it, the camera was long gone. Now, I attach those kinds of items to my daypack with a lanyard. They're still easy to pull out and use, and they never get left behind.

I reverse the batteries in my portable CD player before packing it in my suitcase or backpack, in case it's accidentally turned on when my bag is jostled. I came up with the idea after arriving at my destination to find that the brand-new batteries I'd put into my Walkman were dead.

I bought several items while in London and noticed when I returned home that my credit card number was printed in full on each sales slip. (In the United States, usually only the last four digits of the number are visible.) Travelers should be careful when using their credit cards overseas--don't leave the sales slips lying around.

Need a place for a laptop in your hotel room? Take the largest drawer from the bureau and put it upside down on the bed with the drawer front away from you. This creates a perfect-height desk for while you're sitting comfortably on the bed (you can even lean back on pillows), plus there's side space for papers, and the top leans toward you for easy typing or writing.

Quotetravelinsurance.com gives you comparable details on more than one hundred travel-insurance plans, enabling you to make the best buy. It relies on ratings from insurance industry overseers such as A.M. Best and state insurance commissioners before allowing an insurance company into its extensive lineup.

Whenever I go somewhere, I bring a supply of postcards from my hometown. I write my name, address, and e-mail on the back, and offer a card to new friends so we can keep in touch. I also pack small souvenirs (key rings, etc.) that carry my local sports teams' logos. They make meaningful but inexpensive thank-you gifts for the small kindnesses that ease one's way during a trip.

When overseas, I carry a "cheat sheet" that includes exchange rates and metric conversions. Currency conversions are available at oanda.com.

If you take an overnight flight to Europe and early check-in at your hotel isn't an option, ask the concierge if you can store your luggage until later in the day and use the hotel gym's shower. You'll be refreshed and ready for sightseeing. Pack toiletries and a change of clothes in your carry-on.

Don't settle for the first answer to your travel question. If you need flight information, it's a good idea to phone the airline more than once and ask the same question. Recently, I wanted to see if I could fly standby on an earlier flight the same day. The first time I called, I was told that the earlier flight was booked. The second time, however, an agent said there were in fact seats available, and I could certainly fly standby. In the end, not only was I able to get on the flight, but I was upgraded to first class.