Actual activities, not a ton. It's a lot of shopping, but there are plenty of stores that kids would like. In addition to the ones mentioned above, there's a giant pin store, World of Coke, Sprinkles (cupcake store), Marvel, etc...
Disney Quest is closing in a few months, so that will be gone. They could take a ride on the lagoon in an Amphicar, but not sure how much that costs.