I've always like mid-week, the third or fourth week in June. All the stores are stocked (found that out as an employee - they aren't stocked fully until then), the weather is getting nicer, the lines are short, and the sky's the limit! Or at least the first 311' of it...
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PO!NT OF VIEW - A Different Look at Roller Coasters
http://www.crosswinds.net/~justmayntz/thrills/