Jess,
You are asking questions right up my alley!
So the first things that came to mind really were for earlier in the day, not after dinner. Let me mention a few, in case any appeal to you;
Wild Africa Trek - One of the coolest new additions to Walt Disney World, you get a more authentic safari and even get a yummy, campy lunch!
Surfing Lessons - An early morning thing, but fun and active. And who doesn't sound cool saying that they learned to surf?
Indy Motor Speedway - Indy Car, NASCAR, and luxury vehicle experiences are available, though I would expect that will take you out of your $200 budget.
But you seem to be looking for something AFTER dinner? Decisions, decisions!
I think that
Jellyrolls could be a great next stop for you, since it is just a walk away and the activity is really fun there.
Splitsville is opening up soon in Downtown Disney, which gives you some nightclub action as well as bowling and billiards.
Write me back and let me know the date night that you are going to be there and I can help with an in-park suggestion too, based on what park is open late that night. Also let me know if any of these ideas are up your alley, or if you had something else in mind!
Have a magical vacation!