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If you're divorced and plan to travel out of the country with your children, check the legal requirements in advance. When I tried to take my kids to Cancun, I learned too late that Mexico requires a notarized letter of consent signed by both parents for minors traveling alone or with one parent or guardian. If the parents are divorced, a copy of the parental custody agreement is allowed instead. The airlines enforce this rule before you get on the plane.

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.

Finding healthy breakfast alternatives at an airport can prove difficult. I always travel with an insulated travel mug. Before leaving home I fill it with a high-protein cereal and then request low-fat milk on the flight.

Check out grocery stores in Europe for bargains on wine. On our last trip to Italy, I found a 1993 Banfi Brunello in a small market for $16. If I could find it at all in my local wine shop, that same bottle would cost more than $100. I only wish I had listened to my husband and bought all three of the bottles the store had.

Scuba-diving vacations can get expensive. As I start planning a trip, I call one of the local PADI dive shops and ask the employees about accommodations nearby. They give me hotel connections I couldn't find on my own, and I often save enough to pay for my dives.

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.

Avoid spills in your Dopp kit. Cut up plastic grocery bags into little squares and place them under the tops of toiletries to prevent leaks. Discard the squares upon arrival, but bring extras for the trip back.

If you plan to visit a theme park, always bring a few sandwich-size Ziploc bags. They'll protect your cell phone and wallet when you're riding on flumes and other water attractions.

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.

On international flights, I used to fumble through my belongings--often having to retrieve them from the overhead bin--after a flight attendant appeared with customs and immigration forms. (I don't know of many people who have their passport's number and date of issue memorized.) Now I write all that info on the bookmark of whatever I plan to read on the long flight so I don't have to dig out my passport. I can fill out the card quickly--giving me more time to loan my pen to all the people who never seem to carry one.

Just before a trip to Spain, I emailed myself a list of addresses of the friends and family I might want to email while away. At a cybercafe, I was able to simply cut and paste the list into the address line of a new message.

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.

Carry the exact change for public transportation. In Venice, we were annoyed when a vaporetto (water taxi) ticket-taker refused to give us our change. Later, we discovered that if you don't have the exact fare, ticket agents make no promises about giving change.

I don't go anywhere without individual packets of antibacterial wipes. I slip some in my carry-on, daypack, and shirt pocket. They're very convenient when you can't find any running water with which to wash your hands. And because they're antibacterial, they're also great for cleaning cuts, and the alcohol from the wipes helps stop the itching when you rub them on insect bites.

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.)

Use an empty M&M's Minis tube to carry quarters. The top holds tightly, but still pops open easily enough, and the size is perfect to slip into a car door or bag. I find it very useful when traveling by car (for tolls and parking meters) and by airplane (for luggage carts or newspapers).

If you make a hotel reservation online and then cancel online, print out and save the cancellation confirmation for at least two billing cycles past your trip. After our vacation, I found a "no-show" charge on my credit card for a room that I'd canceled well in advance. Without the confirmation, I had no way to contest the bill.

Place a fabric softener sheet in your suitcase when packing. It'll absorb odors and dampness and keep clothing smelling fresh. It's most beneficial in warm, humid climates and while at sea. I found this quite useful during my twenty-three years in the U.S.Navy.

By starting a blog for each trip--at blogger.com, among others--you can keep your friends and family up-to-date on your adventures. All you need is an Internet café to add entries and photos while you're on the road.

Pay close attention to those newsletters enclosed in your frequent-flier statements. They usually contain special offers and promotions that can earn you double or triple miles if you stay at a certain hotel or eat at a certain restaurant.

Every summer, we drive out West from Pennsylvania with our two kids. To avoid that infamous road trip question ("Are we there yet?"), I give each child a map with our route highlighted on it. Along the way, they can match up the town names with road signs we pass, and that way, they always know exactly where we are and how much farther we have to go until we'll get there.

It's unnecessary to make a packing list for each trip. Instead, draw up a master list with everything you might need on any given trip--from ski goggles to snorkels, slippers to saline solution. Save it on your computer. Before you start packing, cross out anything you don't need for that particular trip.

After looking for years for the perfect toiletries bag and being frustrated by many that were less than ideal, I finally discovered one that is just right: a soft-sided lunch box I bought at the supermarket. It has an outer zipped pocket with small compartments and slots perfect for often-used items like a toothbrush and toothpaste. There's a small removable zipper pouch inside (meant for a small ice pack) for those smaller, hard-to-find items like nail files and pill bottles. The remaining space inside is just right for larger items like shampoo and hand lotion. Other helpful features include both a small handle and shoulder strap and a waterproof, easy-to-clean interior. As an elementary school teacher, I know firsthand that it'll last: It was designed to withstand daily use by kids!

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.

For overnight flights, pack a few Oral B Brush-Ups in your carry-on. Before the plane lands, you can "brush" your teeth, leaving you refreshed and ready for the day!

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.

Online check-in isn't just for airlines. After reserving an Alamo car over the Internet, I was offered online check-in just by entering my credit card number and driver's license information for approval. At the airport, following Alamo's instructions, I informed the shuttle-bus driver that I had checked in online and reserved an economy car. I was dropped off in the lot and told to pick whichever car I wanted. I drove it to the exit, where my credit card and driver's license were verified on the computer, and I was done.

I was heading to the hotel ice machine when I noticed that our ice bucket was looking very tired and missing its disposable plastic liner. My solution: the shower cap that we never use anyway. In fact, it actually worked better than the liner bag because the elastic band held it in place around the top of the bucket.

Save major bucks by going onto eBay and purchasing coupons and gift certificates that others don't want or can't use for lodging, transportation, food, and admissions. I've found great discounts for airline and Amtrak tickets; car rentals; entrance to amusement parks such as SeaWorld, Disney, or Universal Studios; as well as overnights at many hotels. For example, I bought a $30 savings coupon at SeaWorld for only $1. Simply search for your destination and then type in "coupon" or "gift certificate."

Restrooms abroad rarely have hooks on stall doors. Our solution: Pack a small S hook in your shoulder bag and make use of a hole in the wall, a pipe, etc., to hang purses, jackets, or anything else you want to keep off the floor. S hooks can be found in most hardware stores, near the screws and bolts.