When it comes to cutting loose on vacation, there are two kinds of crazy: there's "Whoa, we raged waaaay too hard last night and now have sweet Ace of Base tattoos", and then there's the, "Yea, I can totally dive off that cliff, why wouldn't I want to swim with sharks" kinda nuts. Some lead to regret, others just lead to the hospital. Or at least to a new pair of underwear.
These are 11 of the latter. Crazy outdoor activities that, while they may not kill you -- okay, some of them actually could kill you -- will definitely seem like it at the time.