BEWARE OF JET FUNN!
Anyone interested in renting jet skis, pontoon boats or especially power boats should stay away from this rental agency. Located in Fox Lake, IL on the chain of lakes area, this place is expensive in the beginning and even moreso when you return your boat. Basically, they claim you have some "prop damage" which is chargeable by between $35 to over $150. I've formally complained to the Better Business Bureau and have found out on it and other websites such as CitySearch that there've been numerous customer compllaints on this issue.
Also, they tell you they'll charge for gas fill up upon your return but don't tell you they charge between 90 cents and a dollar more per gallon than market price (gas station down the street was $3.00 per gallon and we were charged $3.95 per gallon).
Stay away.