A.H.
I know of one.
It is on Gull Lake in Nisswa, MN. My father actually lives right next door, and I am up there with my 3 boys very often in the summer. The lake right out front is shallow to allow for awesome swimming. There is a little lake in back that is fabulous for Sunnie Fishing.
I have put an e-mail in to the owners to ask where you can go to rent it. I know they rent it out, and it is inexpensive compared to other spots.
Just an FYI, the best time to go is in August. The lake is as warm as it is going to get, and the traffic out on the lake is not as bad. Everybody always pushes to go in July, but we have found it is more fun in August.
If you have any more questions let me know, and I will forward on the rental info when I have it.
Take care,
Angela