We're going June5-10th staying onsite. I think you might be a bit safer than a couple weeks later (that's what I'm hoping for). I believe most schools around get out after June 10th? At least in my state they do. That will hopefully thin out the school age crowd a bit.
I heard too that Harry Potter will open sometime around May 28th...that's when the Harry Potter packages availability starts on the website.
If you don't mind me asking, which cruise line did you choose? We are looking at a quick 3 or 4 day cruise rather than spending $1400 on Disney World tickets for 3 days for 5 of us! I've starting researching, but haven't figured it out yet. It looks about the same or almost cheaper to go on an all inclusive cruise for the same amount of days! (and we do
Disneyland quite a bit here at home)