Since it was difficult to find much information on Deep Creek Lake area restaurants before I went out there, I thought it might help to post on some of the places I visited, for anyone else who might be venturing out that way.
The regular dinner options were nothing special, but I found the seafood buffet on Friday night ($21.95) to be good value and good eating--plenty of options, including garlicky steamed mussels, fried oysters, a melt in your mouth planked salmon and more (the whole list is on the site). Another bonus is al fresco dining with a great view of the lake.
The food here was particularly good. The full dinners include choice of salads, entree and a good range of desserts. I had a romaine, feta cheese & sun dried cranberry Salad with raspberry vinaigrette followed by flounder with a Boursin cream sauce and angel food cake with strawberries and ice cream to end.
I'm no pizza connoisseur, so I can't verify whether or not this is authentic New York pizza, but it was well done, with a slightly chewy but not doughy, thin crust. We had the rustico, with red roasted peppers, sun-dried tomatoes, black olives and fresh mozzarella. It all tasted very fresh and not at all heavy like some pizzas. You can also order pizza by the slice. The adjacent cafe, Trader's Coffee House, is very pleasant and offers free wireless internet.
The Lakeside Creamery (http://www.lakesidecreamery.com/) is also worth a stop for a cone or a cup after a hard day on the lake.