It depends on what time of day you go and what time of year you go.
At night you can go to the bridge between Boardwalk and Beach Club to watch Illuminations (the mid to higher parts of the show). There's a couple of carnival type games and as someone else mentioned there are street performers some nights and the Surrey bike rentals. There's also a candy/Ice Cream store if you just want an ice cream. There are restaurants (Spoodles, The Flying Fish, ESPN and the Big River Grill) and the general store. In the ESPN store there's some Arcade games. If you just want to see the sights you could always just take the boats that go between the Epcot resorts and the MGM or Epcot parks --- It's quite pretty on the lake at night. We like to just walk the circle around the lake.
During the Christmas/Holiday season there's some nice decorations to see and they had some storytelling, etc... in the lobby.