I understand Seven Springs in Pennsylvania has some serious parks, including, I believe two halfpipes. Depending on where you're coming from in Michigan, it's doable as a (long) weekend. Be warned, though, the place can get crazy crowded on weekends. There's also a big party scene. (I've never seen so many drunks on the mountain as I have a Seven Springs.)
Does Alpine Valley in the Detroit suburbs still do a pipe? I haven't been to Alpine Valley for a few years.
Sooner or later your legs give way, you hit the ground.