If you are close by or in driving distance to the park there is no need to stay overnight. The park is open to all, not only to campers.
You have to. I typically drive from Rochester and hang out on the beach for a couple of hours with my family. Afterwards, we take the trails for a beautiful scenic hike to the Round Lake and back the hit the road back home.
You can stay at either. You have to reserve cabins though and they book fast
Marsha Santiago. It is also a state campground. You can bring a tent or a camper. Google green lake state park. It will tell you all you need to know. And you also have the option of calling their and speaking to a human.
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