Wild Adventures (Valdosta, GA) has those misting stations: just a canopy next to the midway, where the misters are always going. It's a nice way to cool off no matter if you are going from ride to ride or just walking around seeing the sights. Quite frankly, however, it isn't up to the parks -- people that visit parks know that they will be waiting for hours in lines for some rides, and everyone ought to be aware of what standing in the heat can do for you. Bring a bottle of water, wear loose clothing that keeps the sun off you, don't wear totally dark clothing, and know when to take a break. While long, hot lines aren't everyone's idea of a great vacation, we all know that they happen.
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/index.html