At 16,500 acres, October Mountain State Forest in the Berkshires is one of the largest green spaces in Massachusetts. Escape the crowds with a canoe trip on the Buckley Dunton Reservoir. For a longer paddle, follow the blue herons down the Housatonic River. Hikers can savor a 9-mile stretch of the Appalachian Trail, ideal for families. Admission is free; there are also 46 campsites ($12-$14 a night). 413-243-1778

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