Kennywood's admission is $18.95 M-F, or $22.95 Sat & Sun, for a Ride-All-Day admission. They also offer $7.50 General Admission tickets, which are good for non-riders OR if it's a REALLY busy day. General Admission people use ride tickets to get on rides -- $0.25/ticket, most rides are 3-6 tickets.
I've only ever seen one day where General Admission was a better deal if you were staying the whole day, but for a quick lunch break (yes I work close enough ;) ) General Admission + Potato Patch Fries + a few spins on the coasters == lunch heaven! ;)
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--Greg
http://www.pobox.com/~gregleg/