We've never rented a boat there, so I wish I could help you but I don't have information about your question.
We have rented bigger boats with motors from cottage rentals on the lake. It really let's you get around and out there on that big Lake but I could not give you a name of a place. You will need to scout about, research a little but it beats the small boats at the ranger station.
Go to ranger station for information on the boats
Row boats, with oars and flotation devices when we were there a couple years past. Can't remember how much, pretty reasonable if I remember correctly
Thanks! Your answer is awaiting moderation.