Atwood Lake Recs
I've been to Lighthouse Bistro in the West Marina several times for dinner, and it's always been very good -- the menu is fairly extensive, with salads, seafood, pasta, steak, sandwiches, etc. Sitting outside by the lake makes for a nice evening.
I haven't been any place else in the area for years ... the only other nearby restaurant I can think of is in Atwood Lodge/Conference Center, but I can't speak to the quality. I would suggest talking to some of the marina staff or boaters to get good local suggestions.
Have a great time!