We went, and tend to go, the first few weeks in May. Go earlier because even though the schools in Florida don't get out till June - other schools around the country start letting out by the end of May - plus you get Senior Nights in May (or whatever its called) at MK which closes the parks to everyone else except the school kids. Go earlier also because of heat if that is a concern for you - it was brutally hot last May, even in the early weeks. Crowds are described as moderate and they really are. Wait times were about 20-30 minutes, by no means long, but longer than the slowest times of the year. Its a nice time of year but I am changing to February this year as it seems nicer to me to go to the warmer climate while we are buried with 20- inches of snow.