The closest restaurant is Le Bistro, serving excellent French food. It's across the street from the Hyatt. It's a small restaurant with a reasonably priced prix fixe menu. They have a good wine list. Reservations mandatory. Big Water Grille is contemporary cuisine, a 5 minute drive from the Hyatt. Nice view of the lake. We love the chef and they also have a good wine list.
The Lone Eagle Grill, in the Hyatt, has a beautiful setting on the lake and is a fun place for a drink. Bite is another good place for a drink, spinning vinyl on weekends. They serve American tapas. If you decide not to dine at Big Water Grill, they have a nice bar.
Unfortunately, I have no recommendations for breakfast other than the Log Cabin in Kings Beach, about 15 minutes away. It's pretty small and I'm not sure if they take reservations. Without reservations, forget it.
http://www.lebistrorestaurant.net/http://www.bigwatergrille.com/