How do I reserve a boat rental by the lake

Boat rentals are handled by the vendor who operates the store and the kiosk at the lake with boat rentals. You can probably reserve, or rent, right there.

Go down to Lake Brittain. There's a trailer there for water rentals. They take care of it all there.

Well, there's an office there. Try getting a hold of them... I didn't do that there. We enjoyed the walk and view... Good luck! =)