My wife and I just got back from a long weekend in the Owasco Lake area.
We can recommend the Springside Inn for food but probably not for their wine list.
We took a guided tour of several wineries and found most to have exceeded our expectations.
I'm told the wines there have come a long way in the past 5 years or so.
We rented a large, new cabin (www.CrewRestCabin.com)about 50 feet from the lake, found it to be very comfortable and would definitely rent it again.
If you stay there, take advantage of the wood/charcoal burning grill in the back yard, buy some meats and fresh vegetables at Wegman's Supermarket (close by), and make a night of cooking out and enjoying your local wine purchases.