May 2nd update...finally threw in the towel and decided the car will be on the island until sometime in June.  The past several days of really warm weather has cleared the snow but left the ice too fragile at the shorelines to get either on, or off, with the car.  Still 24-30 inches of solid ice cover on the lakes tho  :P
The flooding and weather has broken up the streams and rivers and we usually can depend on having open lakes in about 2 weeks after the rivers open .