Things to do in Orlando: Author Seeks Assistance

Asyouknowbob, Steve and I will be guests of honor at Oasis 23 in Orlando, May 28-30, 2010. We plan on arriving the Thursday before the con, and we know that we don't want to be on or near an Amtrak train on Monday, May 30, Memorial Day. We hope to set up some book signings and promotional things, like we do, but! The question is if we want to take an "extra" day and have a, what do you call that thing? A vacation day.

I have never been to Florida, and wonder what there is to do in Orlando (yes, yes, but I can't imagine having enough money to actually pay for admission to SeaWorld or Happy MouseLand, or that I would actually have very much fun at either). I like aquariums, zoos, art museums, public gardens, amusement parks (though not Insanely Crowded amusement parks), antique carousels, and walking around and staring at things.

Suggestions? Comments? Warnings?

Abundant Spanish Aunts.