Some parks near-ish Kennywood (all driving times are VERY rough)
Conneaut Lake (90 minutes)
Idlewild (2 hours? I haven't been there yet actually, although that'll be remedied this weekend)
Lakemont
DelGrosso's
Six Flags Worlds of Adventure
Waldameer (all 2 hours in various directions)
Cedar Point (3)
Hershey (4)
Knoebel's (4-5)
Six Flags America (4)
SF Darien Lake (4, I think, haven't tried it yet)
King's Island (5)
Dorney (5-6)
King's Dominion (6)
BGW (7)
SF Great Adventure (7-8)
Note that for me driving times don't scale linearly -- a park twice as far away will take a bit more than twice as long to get there since I need to stop and stretch more and more often the longer I'm sitting ;)
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--Greg
http://www.pobox.com/~gregleg/
*** This post was edited by GregLeg on 8/1/2001. ***