Definately among the most crowded times of the season. Not impossible, mind you, but you'll have to sacrifice some things, depending on what you like and what you're interested in doing. If you can change your plans, mid-June to the end of June is the best, IMO, because the weather is getting better but the crowds are still relatively low.
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PO!NT OF VIEW - A Different Look at Roller Coasters
http://www.crosswinds.net/~justmayntz/thrills/ Play Roller Coaster Tycoon? Try it CP style!