YES! Growing up we had one from when I was 3 to high school age. My friend and I would literally jump ALL DAY LONG in the summer. (We didnt have a net on the bigger version even at 3 haha). But we would be mermaids, cloud people, ice skaters, etc. Yes we jumped on it with water too (I know trampolines are generally frowned upon nowadays, especially with water). I never broke anything though.
Dont forget about the sleep overs out on the trampoline at night in the summer. Its more fun with tons of blankets on the trampoline too! Course I am a girl and so we would be giggling and stuff too.
I told my fiancee, and so we decided once we get some grass at his property we are buying one for us even though we are 23 ahha. But I can jump for about 2 or 3 jumps and then I have to cough up so much stuff <img src="i/expressions/face-icon-small-smile.gif" border="0">