Haven't been to a theme park in years. The only one I've been to really is Chessington World of Adventures, and that was about ten years ago or more. The best rides there were Ramses' Revenge that turned you upside down and squirted water at you (somewhere at my parent's house there's a picture of me and my cousins and aunt on it.)

I was also partial to the Vampire Ride rollercoaster, which I went on four times. It got lamer with every ride though, as I knew what was coming.