We just went to an American Civil War re-enactment battle at the Chisholm Park on the shores of E lake Toho at the St Cloud end of Narcoossee Rd which is an extension of the back road from the South Exit of Orlando MCO airport to St Cloud/Kissimmee area.
Its the 3rd weekend of every March so you can't go until next year but we can thoroughly recommend it, $5 to get in (free parking) and a program, authentic civil war camp to visit, hundreds of properly uniformed soldiers on both sides,cavalry horses, artillery, and a great mock battle with an informative commentary.
There are even stalls set up where you can buy memorabilia and uniforms etc.
Some of the combatants come several thousand miles to take part, its a great tradition down here.
If you want more info just google it using "battle narcoossee mill" as the keywords and some info should come up.
Great for kids and adults alike and lots of friendly locals there but not overcrowded by any means.
Rather more real than Medieval Times, See the Real South! There is more to Central Florida than theme parks with expensive admissions.