It is pedalparties.com
It holds 11 people, 8 pedaling, 3 riding and is $250 for 2 hours.
I've done it with my softball team and we had a blast. It is just like in a golf cart, no open containers. They start up around beef o'bradys and go to sumter and stop at 2 or 3 places for people to get off and grab a drink.
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They are also on facebook. I heard that in January they are going to do scavenger hunts and poker runs where people can book single seats.
Oh another thing we loved about this one, the one we did in Tavares was pedal powered ONLY. Our legs were killing us! On this one, when we didn't want to pedal, we hollered and the driver engaged the electric motor!