Mine is kept in a 100 gal. fish tank, half shallow water, and half dry land w/ a heat lamp.
I feed it salami, crickets, lettuce, cottage cheese, and other turtle foods.
I would really like to let mine go, but the fact is that
a) it was born into captivity and I dont feel safe letting it go alone
b) there's no real good place for wild turtles around here
I have a lot of turtles, mainly one's that Ive rescued, and I make outdoor habitats for them, so at least they can feel comfortable.
I've released 2 snapping turtles, not too long ago, back into the wild (well this contained ecosystem that my old schools used to take field trips to). It seemed like they would like it there better than in a backyard