8 Worst-Case Travel Scenarios

If you start to feel a painful blister coming on, put some lip balm or Vaseline on the hot spot--it'll help stop the rubbing.

If you're a woman traveling alone, or your accommodations don't inspire confidence, simply wedge a small rubber doorstop at the base of the door when you're inside the room. It'll be virtually impossible to open the door from the outside.

A simple but effective anti-pickpocketing measure is to fasten a safety pin across the opening of the pants pocket on the inside. Leave enough room to pull your wallet out with some effort, but not enough for a quick hand to lift it in a second or two.

Rather than risk losing your department-store credit cards and club-membership cards, you should really leave them behind when you go somewhere you won't need them. Your purse or wallet will be lighter and your worries fewer.

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.

In order to keep track of my bags, I use a small metal bell--the kind dancers from India wear on their ankles. I thread it with fishing line and tie it to my carry-on. If anyone touches my bag after I set it down, the bell chimes. It's not a very obtrusive sound, but it's distinctive enough for me to notice if a thief is trying to get into my things. The same bell can be hung on the doorknob inside your hotel room.

A padlocked zipper tells thieves there's something in your bag worth stealing, but a key ring is much less obvious. Just use it to latch together the zippers. Best of all, you'll never have to worry about forgetting your combination.

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.

We all know to avoid drinking tap water in certain countries, but remember to forgo ice cubes, too. I've started bringing along two ice trays, which I fill with bottled water and freeze in my hotel room's mini-fridge.

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 be afraid to go to a foreign pharmacy. I forgot to pack my prescription medication on a recent trip to France. When my problem acted up, I went to a local pharmacy. (Look for the green cross.) The pharmacist provided my medication without a prescription and at a fraction of what it would have cost in the United States. In fact, one could benefit by stocking up abroad on medications that would normally be acquired at home at a much higher price.

Place a coin over the veins on the inside of your wrist (about two finger widths from the base of your palm) and secure it in place with a rubber band or ponytail holder. The gentle pressure of the coin will stimulate nerves that control nausea, just like the motion-sickness bands that are sold at drugstores.

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.

I agree that the anti-seasickness medication for cruises, Bonine, is excellent and effective; but there is a budget way to buy it. The primary ingredient in Bonine is meclizine (25 mg). While a package of eight Bonine tablets costs just over $4 at a drugstore, you can buy a bottle of 100 generic meclizine (25 mg) for about the same price. This is an over-the-counter (no prescription needed) item, but you usually have to ask for it at the pharmacy counter.

Paramedics now look for emergency contact information in victims' mobile phones. Store the word "ICE" (In Case of Emergency) in your address book, along with the name and number of the person you'd like emergency personnel to call on your behalf. (For more than one entry, use ICE1, ICE2, etc.) Tell your friends or family members that you've chosen them as your contacts and make sure they're aware of any medical conditions or allergies that could affect your treatment.

Whenever I'm in a country where drinking or brushing my teeth with the tap water is a risk, I cover the faucet handles in my hotel bathroom with a towel. As a result, I never accidentally turn on the faucet when I'm half asleep.

Make your cabin homier by packing a small collapsible vase and a bouquet of flowers.

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.

A small compass is a great travel aid. Aside from the obvious benefits during country drives or hikes, it's extremely helpful in navigating winding city streets and orienting yourself once you exit a subway station.

Before traveling overseas, look at your health insurance card. If it only shows an 800 or 888 number for precertification of hospital admissions, call that number and obtain the local number with an area code. Many 800 numbers can't be dialed from foreign countries. I learned this the hard way during an emergency hospital admission in Switzerland. The delay in reaching my carrier could have been avoided.

If you're headed to a country that requires a visa, ask the consulate of that country, in the United States, whether visas are also issued at the airport there on arrival. In many cases (like Turkey and Egypt), they are. Obtaining the visa on arrival is a much simpler procedure and a real money-saver: You do not have to have photographs taken (they figure your passport already has a photo), you do not pay a hefty fee to the U.S.-situated consulate of the country, you avoid the expense and risk of mailing your passport to that consulate in advance of departure, and you avoid the expense of using a visa-acquiring company in the United States. But be sure the consulate is correct that the visa can easily be obtained on arrival.

The couple of hangers provided on cruise ships aren't enough for weeklong trips. So I save wire hangers from the dry cleaner and slip a few into our suitcases while packing. I then leave them behind for the next passenger.

When I go on a trip that requires me to accessorize a number of outfits, I buy little Ziploc bags and place the appropriate jewelry/panty hose/scarf inside. Then I punch a hole just big enough to slide the bag over the outfit's hanger. This way, my panty hose stay snag-free and my jewelry never gets misplaced.

My husband and I travel to out-of-the-way towns where rural roads can be hard to navigate. We use a handheld GPS (Global Positioning System) to mark the spot where we're staying, the main highway turnoffs, and, most important, the turns to unmarked side roads. When we're back-tracking and arrive again at confusing intersections, we whip out our GPS and immediately know which route to take home.

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.

Get the right maps. For road trips on the Continent, European maps are much more helpful when it comes to reading road signs. They'll say Napoli instead of Naples, Firenze rather than Florence. I could spend all day waiting for a road sign for Munich and miss the exit for Munchen.

Put your perfume and cologne bottles inside pairs of rolled-up socks to keep them cushioned during your journey.

On my first trip to Cancun, I noticed that my hotel room had a damp, musty odor. The next time I went, I brought two plug-in air fresheners: one for the bedroom and one for the bathroom. This helped tremendously. It was a pleasure to walk in and have a fresh-smelling room. Just make sure you have an adapter, if you need one.

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

When I travel to a new city, I check with the local running club to see if there are any events planned during my stay. The entry fee is usually donated to a charity, and I get great exercise, meet locals, and tour a part of the city I may not have known about.