Situated at 16821 O’Brien Trl N, Marine on St Croix, MN, William O’Brien State Park is a beloved state park known for its exceptional outdoor opportunities. Boasting a remarkable 4.7-star rating from more than 1,200 visitors, this park is perfect for hiking, picnicking, and wildlife observation. Its spacious trails and scenic river views make it a top choice for families and adventurers alike looking to explore Minnesota’s natural beauty in a peaceful setting.
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