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Arnold Arboretum Harvard
The Arnold Arboretum of Harvard University is a museum of trees teaching the world about plants, spread across a 281-acre preserve. Plenty of privacy here with all the trees, especially when the leaves are out. Popular in the evening, but you may find action at any time of the day. It's a mixed crowd, including married men, students and laborers. Check behind the Hunnewell Building, Hemlock Hill and behind the State Lab.