Solitude FinderRock Island State Park, WI
On a weekday in June, you could be the only overnight visitor to this tiny park dangling into northern Lake Michigan. Until July, less hardy campers shy away from the cold winds which sometimes blow off the lake—June highs can be in the low 40s. Layer up and take advantage: The 912-acre haven offers seven miles of trails along sandy beaches and through old-growth-covered hills and hollows, plus 150-year-old Pottawatomie Lighthouse (only 41 feet tall, but the oldest in the state). Reserve remote campsite C, a 1.5-mile walk from the ferry dock, for sky-filling sunrise views over the lake. Contact (920) 847-2235; dnr.wi.gov
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