Green Lakes State Park's outstanding features are its two glacial lakes surrounded by upland forest. Both Round and Green Lakes are meromictic lakes, which means that there is no fall and spring mixing of surface and bottom waters. Such lakes have a high potential for evidence of ancient plant and animal life. Another special feature of the park is the 18-hole Green Lakes State Park Golf course designed by Robert Trent Jones, where visitors can snowshoe in winter, and there are 10 miles of trails that cross-country skiers can use.
Green Lakes is nice for a day at the beach. They've got grills and a great playground right by the swimming area. As far as hiking.. it's more a beautiful walk around the lakes. We have found that the lake is not great for fishing, bikes are not allowed on the trails, and you can rent a canoe but can not launch your own. It tends to be fairly crowded. Overall we do love Green Lakes as it is our local "go to" beach.