We loved the arcades at YC and CBR when we stayed there. Don't know where you are staying but I imagine all the resorts have them. Then grab a late dessert and explore your resort at night. We also enjoy the Boardwalk at night with all the street performers and games. Grab an ice cream or some taffy at the sweet shop. And there is an arcade at ESPN (can you tell that DH and I love our games

).
And all the christmas decs will be up so go check those out - especially at the GF and the other deluxes. I've heard of some really cool things there.
Have fun - the evenings during off season can be really relaxing and fun!