First off, does that really work, taping the edges and jumping on the trampoline? I'm dumb enough to try that. Anywho, if you hate not skiing in the summer, learn how to skateboard. It's tons of fun, you can do it anywhere, after the initial purchase it costs almost nothing, and can provide that fix for danger, speed, learning new things, pain, whatever else you get from skiing. Not so much the powder or the trees, but you can work with it.