I've worked at Cedar Point, and I can honestly say it was the best AND toughest job I've had. I worked in rides and got bumped around a bit, so I had to learn things very, very quickly.
The 2 big things about working at CP is you 1) need to be EXTREMELY friendly and 2) need to be able to learn fast. In the 3-4 months I worked there, I was on 15 different rides. 8 of those I had to do speeches and speels (In maXair's case, 2 in a row). I had long hours (4th of July was 14 hours with 3 breaks), and the pay is pretty sub-par. I was usually working anywhere between 45-65 hours a week. And I was on Turnpike Cars.
Comparatively, I worked at Six Flags Great America, and their training was very, very detailed. Everyone was required to attend 3 days worth of video watching, manual reading, park observing glory. Everyone was required to be trained on Kiddie rides, and everyone had to take a test and pass with a 100%.
Do remember, if you want a theme park job in rides, you may get stuck with a crappy ride. Both of the parks I worked at I was never assigned a roller coaster, and usually never worked on one. The job gets stressful with some guests and can be dangerous with other guests (see SFoG Batman). If you're up for it, I'd try working at a closer park then CP.
