Adventure travel is now becoming popular with many teenagers. Gone are the days when you could only go on vacation with adults. From heli-hiking and mountain climbing to white-water rafting or whale-watching, adventure vacations can now give you more varoety and excitement than ever. You don't have a be a top athlete to go on a walking, sIling, or sports bacation, but you do need to be well prepared in lots of ways. If you and your friends are planning an excoting trip somewhere this year, there are a few things you ought to know before you set off.