I used to skateboard. then i tried mountainboarding a few years back (when i was in my 30s). check out mongoose site, or google atb (all terrain boards). they are bigger out west apparently, kind of like snowboarding w/o snow, bigger board, wheels. not fun for just riding straight (need a hill).
now i get my thrills on me bike. arrgh.
let me know if you want any more info (others on this site probably have more experience w/ these)