Potato Creek State Park near North Liberty covers about 3,840 acres of woods, fields and wetlands centered on Worster Lake. It sits within easy reach of South Bend and is one of the most popular parks in northern Indiana. The lake supports swimming at the beach, boating and fishing, and trails lead through a variety of habitats. A large campground makes it a great choice for families and groups who want to stay several nights, and the nature programs add to the appeal. Entry is $7 per vehicle with Indiana plates and $15 for out-of-state vehicles, with camping rates varying by site. Summer weekends are busy, so reserve your campsite early.