You've come to the right place. I worked as a seasonal landscaper at CP for 6 seasons (1993-1997) and still keep in touch with the staff. There are seasonal landscaping jobs available from mid-March through early November. I know there have been others in the past who have used the job as college credit.
I can give you more info about any aspect of the job you want. Just let me know what kind of questions you have. If you want, you can e-mail me direct at walt@schmidty.com
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Cedar Point Virtual Midway
http://www.virtualmidway.com