No offense to "the happiest place on earth," but Legoland Florida is at the top of my Florida attractions list.
The theme park is extremely homeschool-friendly. If you attend on a special homeschool day, tickets are only $8 per child and $25 per adult chaperone. If you have a large family or another homeschool family to join you, call them about special school group pricing for groups of 15 or more (the same or better than the homeschool day admission rates). The best pricing for children on their website is $62 and adult tickets are $69, so this savings is significant! It's worth taking the time to explore their website and make advance reservations (required for homeschool rates).