Most of the time I launch at Prendergast. It is a great launch for the summer and would have no problem handling your size boat. I find that it can be too shallow to use in the late fall, so I normally switch over to Long Point.
Long Point is no doubt the nicest launch on the lake, but you have to pay an entrance fee to get into the park during the summer. These fees are waved if you have an empire parks passport.
--Joe