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The Scene – This 2,200-acre reservation, almost three times bigger than Manhattan's Central Park, was established in the 1880s as a "healthful resort" for Lynn's working population. The hills and valleys are sprinkled with small swamps and shaded by hardwood forests. Other popular activities here include birdwatching and cross-country skiing. – – The Experience – Lots of technical single track in the hills around Walden Pond. The city's reservoir (not Thoreau's campground) divides the woods in half. Beginners should stick to the wider paths of gravel and feather the…