In no order I would go with Cedar Point, Kings Island, Kings Dominion, Hershey, and Knott's Berry Farm from the ones I have been too...I'm planning trips to Kennywood this weekend and Hershey again...and next summer to Canada's Wonderland and Carowinds so that may change.
1 - blackpool pleasure beach
2 - alton towers
3 - chessington world of adventures
4 - oakwood theme park
5 - disneyland paris (inclusive of MGM)
6 - thorpe park
7 - flamingoland
8 - fantasy island
9 - lego land winsor
10 - not decided
1. LiseBerg (Amazing atmosphere, amazing rides and overall a great park)
2. Heide Park (the park is enormous, and incredibly beautiful)
3. F?????????rup Sommerland (Obstacle course rules! [;)]
4. Knoebels (Because of their foor and the Phoenix[:D])
Parks that diseapointed me: Alton Towers, Knotts, Mt Olympus and SFNE