Basically, you can get either a small popcorn, a piece of fruit, a soda, a bottle of water, or a Mickey ice cream bar. There are some rumors that some places in EPCOT's WS let you get an ethnic treat, and a place in MGM that lets you get dumplings, but those can depend on the CM and their interpretation of the DP. In the resorts, you can sometimes get rice krispy treats or cookies, but again that varies by resort. The snack credit does not include things like Dole Whips, smoothies, et all.