We were there in April and loved Alex & Ika. Best mac and cheese I've had in a long time, and my husband raved about the enchiladas. Doesn't look like much because the kitchen is in the front -- you have to walk around the side to get in the dining room.
Friends who have a cabin in the area highly recommended the Yum Yum Shack south of town, but it had not opened for the season yet when we were there.
Yum Yum Shack
4918 State Highway 80, Cooperstown, NY 13326