Groupon has a deal for Skeletons Unveiled for $22 for 2 people right now. The museum is in the complex by the Orlando Eye. We really enjoyed it, but we do love science.
You could just spend the day enjoying Disney Springs, (grab a budget lunch at Earl of Sandwich), take the boat to Port Orleans for some beignets, check out the free entertainment. We sometimes take the bus from Disney Springs to the Polynesian to get some Dole Whip before heading to the Grand Floridian to watch the Magic Kingdom fireworks from the boat dock. It is always a fun day and free, except for food. We finish up at Raglan Road and listen to the celtic band until 1am.