Firewatch is an exploration game/visual novel set in Shoshone National Park. You play a bearish guy with heartbreaking relationship problems who's decided to become a fire lookout to escape the aforementioned problems.

The park is very pretty; the narrative oscillates between Lost and Sleepless in Seattle, though not in the worst possible way. It's very short -- maybe 4 playable hours, which is a little short for $20.