Guys, which present would you rather?

I'm trying to figure out what to get my bf for his bday. Some of his interest are dirt bike riding/racing, jet ski riding/racing, anything that is thrill seeking. I have some inexpensive things I plan to do, but I was wondering if I should get him a pressure washer (he wants one) or take him skydiving (which I don't know if I'm brave enough to go with). I plan to spend about $300 or so. What would you want? He's turning 28.