Where are you staying?
The marinas have rental boats. I am not aware of any that rent row boats. Probably too much of a liability with the big boats and big water.
Check out chics to see the approximate costs and rent from a marina near where you are staying.
http://www.chicsmarina.com/boat-rentals/
Rental Marinas
http://www.visitlakegeorge.com/water/boat-rentals
Based on an MDW report below looks like bassin' is heating up. You will need down riggers for trolling the lakers this time of year
might be worth hiring a charter or guide rather than battling the learning curve.
http://www.visitlakegeorge.com/recreation/local-guides
