Tempe, Arizona

Traveling to non-English-speaking countries can be daunting for people with food allergies. Find someone fluent in the local language to write out what you are allergic to, the seriousness of the allergy (we had a friend include the phrase "this could kill me"), and what to do if you fall ill.

Don't assume a single room costs less than a double one. I booked a hotel in Spain online and noticed that rates were the same whether I booked a single or a double, but the single was much smaller and its bathroom had only a small shower stall and no tub.

It helps to have a calculator if you plan to do a lot of shopping in foreign markets. When you find something you like, hand the seller the calculator and ask him to enter his best price. It's easy to convert the response into dollars so you know what you're spending. If necessary, the calculator can be used to haggle, especially if you don't speak the language.

Put an address label on your one-time-use camera. At a Final Four game in Indianapolis, we exchanged identical Kodak Fun Savers with another traveler so that we could take souvenir photos of each other with our respective cameras. But afterward, we couldn't tell whose camera was whose. Luckily, I remembered how many exposures remained on mine, so we got ours back. Next time, I'll just label it.

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.

Before traveling to any city, do a search on the Internet of the city name and the word "coupon" ("New Orleans coupon"). You will find many sites offering two-for-one, percentage-off, and dollar-off discounts. On a recent trip to St.Louis, we saved $100 at restaurants and attractions.

If you go directly from the air-conditioned ship out onto the open-air deck (which is usually warmer and more humid in most cruise destinations), your camera's lens is likely to fog up. Warm the camera with your cabin's hairdryer on a low setting or briefly leave it out on your balcony so it can acclimate to the weather.

Want to visit museums with your children without the boredom and tears? Go to the gift shop first and buy postcards of the museum's most famous works. Have your kids treasure hunt for these masterpieces. When you get home the postcards can go right into your trip album.

If you're planning to use an ATM abroad, make sure the money you need is in your checking account, because some foreign ATMs don't allow access to savings accounts. And remember to carry your bank's local phone number with you; 800 numbers generally don't work overseas.

We've traveled to both Mexico and China in the last year and had the same experience in both countries: When we tried to exchange dollars to local currency, the banks wouldn't take bills with graffiti on them--telephone numbers, names, doodles, anything. Nor would they accept any bills that were torn or damaged. (We noticed a group from France having the same problem with their euros.) So before you leave home, make sure that any money you plan on exchanging is absolutely crisp and clean--or better yet, ask your bank specifically for brand-new bills.

On a trip to Molokai, the plane we were on was small, and luggage was crammed in every which way. At baggage claim, we noticed that someone had packed a bottle of Pine-Sol, and it had broken and leaked everywhere. Now we line our suitcases with garbage bags to protect our clothes—just in case. (It's also smart in case your bag gets left on the tarmac in a downpour.)

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 find that hotel bathrooms rarely have enough hangers and hooks for clothes and wet towels, so I always bring a few snap-lock suction hooks. (They function better than regular suction hooks because they're more secure and are therefore able to hold heavier items.) It's always nice to have a place to hang a bathrobe.

Pack light, or that great deal you found on airfare won't seem that great. On a Ryanair flight between Glasgow and Dublin, my husband and I were charged over $100 for excess baggage weight (the airline tickets themselves cost less than half that). Be sure to check the weight limits—especially on low-fare airlines—before you leave home.

If you visit a country where you don't speak the language, pick up a book of your hotel's matches or one of its business cards; they usually have the hotel's name and address printed on them. Then when you're out sightseeing and want to return to your hotel, show the matchbook or card to the cabdriver if he doesn't speak English.

When we visit places we think we might return to, we collect copies of free tourist magazines. At home, we write the address of each magazine on a postcard. Six to eight weeks before our return visit, we send out the cards asking for a current copy. The magazines are full of useful information.

Driving around Italy last summer, my husband and I found that even the most detailed maps left us scratching our heads in confusion. Desperate and lost, we decided to follow a tour bus. Guess what? It got us exactly where we wanted to go.

When looking for the lowest airfare, I've found that in some cases the best rates pop up when searching for one traveler instead of two. Recently, I wanted to buy one-way tickets from New York to Orlando for two people and came up with $87 per person. But when I selected one traveler, the fare dropped to $72.

When we come home at night, my wife and I each take a dollar from our wallets and put them in a special spot. We deposit what we've collected into a travel account at our bank every few months, so at the end of a year, we have $730 toward our next vacation—not counting interest.

Before leaving for a vacation, I print out all our reservations and directions, and I create a contact sheet for emergencies. Then I gather all the papers together, punch some holes, and place them in a folder that has a middle section for three–holed papers. The side pockets hold brochures, business cards, ticket stubs, receipts, and maps that we collect along the way and want to bring home for our scrapbook.

When traveling in the developing world, I always bring several packets of stickers to give to children. They're wonderful icebreakers.

When I'm on a cruise with my wife's family and we're in a foreign city for the day, I get off the boat as soon as we dock and hail a taxi. I ask the driver to call his dispatcher and find me a van with an English-speaking driver. Then I negotiate an hourly rate and a pickup time at the dock. The family tours together for a few hours, and then each couple either gets dropped off where they want to spend extra time or returns to the boat (this is great for my elderly in-laws). We get a tailor-made city tour for a much cheaper rate than if we had booked through the cruise line.

Bring a single-hole punch and lanyard on your next cruise. Once aboard, you can make a hole in your plastic key card and attach the lanyard, allowing you to carry the key around your neck. This is especially useful when your dress or slacks have no pockets. Just be sure to put the hole where it won't interfere with the card's magnetic strip.

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.

Before you go to sleep, check to see if a previous hotel guest left the alarm clock on. I've been awakened before 7 a.m. twice in the last couple of months by alarms I did not set. (Make sure the clock shows the right time, too!)

The help of a concierge at an expensive hotel is available even if you're staying at a motel across the street. Go to the concierge with $5 (or whatever the assistance is worth to you) held discreetly but visibly in your hand. Chances are you won't be asked whether you're staying at the hotel. This worked for us once when we were stranded by a blizzard. We tried to rebook our flights on our own, but phones at the airlines were busy for two days straight. The concierge at a fancy hotel a few blocks away got through on his first try and managed to rearrange our flights for us.

A shoe organizer hung over the bathroom door is my solution for hotel-room clutter. The compartments are perfect for stashing everything from room keys and travel documents to toiletries and, of course, shoes. The extra storage space came in especially handy on a recent cruise, when we needed all the room we could get in our tiny cabin.

I always pack several tea lights, a small vial of essential oils, and matches. Tea lights, when placed in a water glass for extra safety, banish stale or unpleasant smells in hotel rooms. The essential oils work wonders when a drop is placed on a warm lightbulb.

Before you head to the airport, make a list of all the items in your checked luggage that would be prohibited in your carry-on. If an item (such as a knife for a picnic) makes its way into your purse or daypack during your travels, it should be accounted for when repacking and put into the checked piece to avoid hassles at airport security.

We were told by an airport security official to tape a business card onto the cover of our laptop. Turns out he has an average of six laptop computers left behind each day! There are so many more procedures now--removing shoes, removing coats--that people forget when they send their laptop through in a separate bin. The official added that it's very difficult to return them because most laptops have passwords that keep the owners' personal information hidden.