If you haven't yet, and the menu looks good and/or reasonably priced for your budget, I would try to get an ADR for Flying Fish. It's a FANTASTIC restaurant.
Every evening they have "street" entertainers on the Boardwalk, the schedule should be on page 1. They're aimed at kids (and yours are the perfect age), but as adults we've liked a lot of them, too. When one finishes a new one will usually already be setting up on a different part of the boardwalk. And they're paid by Disney, no tipping hat gets passed around!
Without the kids, there is Atlantic Dance (a dance hall people don't talk about too much), and Jelly Rolls, a dueling piano bar that many people love, but it has a cover charge, and you'd have to leave the kiddos wih your mom.
They also have kids movies by the pool in the evenings, as do all the Deluxes, I believe.
Enjoy!