What to do with kids on the Cape, on a rainy day?

[Jim in CT]

Our second annual camping trip to Eastham is coming up. We have a fishing trip booked on the Beth Ann, and a lobster boat tour booked out of P-Town as well (an awesome way for kids to have fun on the water).

Any suggestions for what to do if it rains? Hotel affiliated with the campground has an indoor pool. Wellfleet has a movie theater. There's an aquarium in Woods Hole. What else?

THANKS!