I was looking for some extreme sensations last week so I went parasailing in western Mexico. You know you can do whatever you want outside US borders, but sometimes it can get pretty dangerous.
I didn't even realize that I was flying 1500 feet (~ 460 meters) above the Pacific Ocean. The view is amazing, as you can see in the pics. Considering that you only have to pay a few bucks for the ride, I can truly say it's worthwhile.