My favorite people-watching place is the Belle Vue at the Boardwalk. It's always an interesting mix of people/groups inside the bar area, on the patio it is fun to watch the courtyard and boardwalk. While no apps, there are many food options near the lounge.
BW for the following:
1. Old penny arcade machines just off the lobby
2. Belle Vue
3. Watching the fun at night in the grassy area outside lobby/boardwalk
4. The music throughout
5. Action on the boardwalk
6. Shorter walks to Epcot and Studios
Before you eat, you could hit up the Barefoot pool bar at Poly for a drink on the beach. Also, I suggest getting a 'to go' cup when finished at poly, and then walking to GF, especially if weather is nice.