Getting to the trailhead
Most countries require both a valid U.S. driver's license and an international driving permit ($15) to rent a car. Get one at an AAA office or apply online at aaa.com.
Only use licensed taxis, and ask for a price quote in advance.
Keep your pack with you if at all possible; if not, stowing it under the bus, not on top, is safer. Up your chances of getting a seat by arriving early or boarding at a station, not a neighborhood stop.
Book a sleeper car on an overnight train to save transit time. Ask how long the train will stop at your destination–if it's short, retrieve your luggage before the stop is announced and wait near the door so you don't miss it.
Sign up for an online phone service (like Skype or Yahoo! Voice), then call another computer from an internet café for free.
Buy a calling card at your destination and dial from any land line phone.
Rent or buy an international prepaid cell phone at cellularabroad.com (about $20 and up, plus upwards of $0.30 per minute for talk time).
Credit cards get the best exchange rate; if you're changing cash, local banks beat airports and currency exchanges. Get local currency at an ATM (but be aware of your bank's foreign transaction fees) and make sure you have small bills for shopping. Arrive with cash on hand by exchanging money at an AAA office pre-departure: You can get up to $100 in pounds, euros, pesos, and Canadian dollars.