I just found this on msn.com. Here's the top ten from the editor of msn/citysearch.com (in alpahbetical order):
Astroland Amusement Park - Brooklyn, NY
Busch Gardens - Tampa Bay
Cedar Point Amusement Park - Sandusky, OH
Disneyland (MK not DCA)
Kenneywood Park - West Mifflin, Pa
Knott's Camp Snoopy - Bloomington, MN (it's the one inside of the Mall of America)
MK @WDW
Paramount's Carowinds - Charlottem, NC
Sanata Cruz Boardwalk - Santa Cruz, CA
Six Flags Astroworld - Houston, TX