Thanks guys! None of us are nuts about the prospect of the heat, but we do like swimming and the waterparks (but we northerners go waterparking in December, LOL)
Some of the crowd information indicates that it will be about even. We've never been in the summer, so I don't know what to anticipate, but we've been at other peak times and have done fine. Although, it would be nice to not have to plan around crowds for our park days...but I don't know if either of these time frames would afford that anyway.