Start as a lowly redtag, come back year after year, work the whole season (as best you can) including bonus weekends, and apply for full-time when it becomes available! As for college programs to help: business management, tourism, accounting, catering (all depending on what department/area of the park you're interested in), and I'm sure others like public relations/marketing of course. :)
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PO!NT OF VIEW - A Different Look at Roller Coasters
http://www.crosswinds.net/~justmayntz/thrills/