For a quick getaway that isn't far, Little Bennett is a great campground.

The staff is very helpful (they were great about helping me aid a lost 6 year old in finding his father).  They've got nice hiking trails, an adequate camp store (with a milkshake machine), a jumping pillow and other activities for kids. They even do outdoor movies. 

The campground is easily accessible in case you need to run out for forgotten supplies. Campsites are spacious and bathrooms, etc. are nearby.

Perfect for anyone, especially families.