I frequently get calls from people wanting to know where they can rent a boat on Lake Hartwell.   Harbor Light Marina is located right at I85, Exit 177.  You can see the marina as you cross the state line into SC.  They have a good selection of pontoon and deck boats that you can rent for a half day up to a week.  If you prefer to go out in an inboard ski boat, just pretend like you want to buy a lake property, and give us a call.  The daily fee will be quite low, but the ultimate cost could be a bit higher.