I worked for Great America in Chicago for 12 years. I was in the park services department - the people who clean. It started out as a summer job, then when I got a 'real job' I stayed on part time.
I know personally, I wouldn't want to do any of the jobs you listed because most of them involve standing in one location all day. But that's just me. The job I had let me move around the whole park, and not be tied to one specific location - the negative was that I was cleaning!
As far as pay is concerned... well yeah, it's not great. I'm not sure how much different the pay scales are at SFOT versus SFGAM, but at our park, 15 yr olds were paid minimum wage, older than that depended on the department - generally didn't exceed $8 per hour.
If you like talking to people, the jobs listed are great - you'll do that all day.
Great summer job - but something that would be difficult to live on. It's a neat atmosphere and you'll meet tons of cool people. My first year there was the most fun i've had in a long time.