Although I can't speak to the Lake Mohawk area personally, I've heard great things about Il Porto and Casa Mia.

Beyond Lake Mohawk, there are lots of new or thriving restaurants in the towns surrounding Sparta. A new Argentinian BBQ place opened on 206 toward Newton I've been dying to try - maybe 15min from Sparta. Stonewood Tavern and Halula Sushi in Byram are pretty good, and Black Forest Inn is great if you like German/Austrian food.