I tried Wagner's for the first time the other night. Much better than fast food, not much more expensive, and you can take the kids there in their pjs. The food is served on trays attached to your car window (old school). The burgers are great, as are the malts. The cherry Coke is the real soda-fountain deal. The staff was friendly and the service was quick. Picnic tables are available if you prefer dining al fresco. Note that they're closed in winter.
Pros: Fun for the kids, good food, good service