Pentwater is located on Lake Michigan, 45 miles north of Muskegon. From the North: Take US-31 South to the Pentwater/Oceana Drive exit and head west following Oceana Dr/Business 31. Hill and Hollow Campground is 2.5 miles west of the US 31 Freeway. From the South: Take US-31 North to the Pentwater/Monroe Rd exit and head west following Monroe Rd/Business 31 through the town of Pentwater. Hill and Hollow Campground is approximately 1 1/2 miles north of the village of Pentwater.