Mill City Park sits right in downtown Franklin at Franklin Falls on the Winnipesaukee River, already running as New England's first whitewater park with drop structures and a slalom channel built for kayakers and rafters. The dedicated surf wave hasn't been built yet — it's slated for the park's next construction phase, which calls for two new drops specifically shaped to throw a surfable face. Until then, a small hole kicks up an occasional wave that locals will hop on when conditions line up. Worth watching if you're in New England and want first dibs on a proper green wave once construction wraps.