May crowds are incredibly light no matter when you go (except opening day, of course), and you'd have no problem getting on all the rides. There will be a lot of school groups, but they leave around 6pm so you'd have a couple extra hours. The thing to remember about May, though, is the weather is the worst then: cold and rainy more days than not, especially being right on the lake. Dress warm! Personally, I'd wait until mid-June, because the crowds still aren't bad but all the stores are pretty much stocked by then and everything is really going well
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PO!NT OF VIEW - A Different Look at Roller Coasters
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