Top things to do at William O’Brien State Park in Minnesota

One of the closest state parks to the Twin Cities, William O’Brien State Park in Marine of St. Croix is a perfect day trip from Minneapolis and St. Paul, MN. Hike under 100-year-old pine trees, next to the St. Croix River and wetlands, through prairies, oak savanna, and hardwood forests. Other highlights include a huge beaver lodge and a small lake with a sandy beach and fishing pier.