What are you looking for? Historical, nature, or the more normal tourist stuff?
The Keys are fantastic, but not likely a possibility on your trip this time. St. Augustine isnt too far, and has the historical element and decent beaches. North a little to Jacksonville, there are many state parks. On the west coast, weve got many beaches consistently rated in the top 5 and 10 beaches in the country. Some of those, like Fort Desoto and Cladesi Island State Park, also have a great natural element to them.

Then there is the more normal tourist stuff like theme parks. Sea World has just opened a brand new water park that I think would totally be worth checking out. They also operate Discovery Cove, which, depending on your budget and personal tastes, could be really cool.