They're beautiful, fun to find and the whole family can mine for them at the Herkimer Diamond Mines, part of this KOA Resort. Actually quartz crystals, the stones were faceted by nature half a billion years ago. Here, experience Upstate New York's largest jewelry store, museum, a fossil-and-gemstone sluicing area and an activity center. Stay in themed cottages and lodges (tree-house, solar-powered, astronomy, robotics and more!). Dine at Miners' Table, a wood-fired pizzeria and chophouse. Alongside KOA's campsites, the West Canada Creek offers trout and fun for canoeists, tubers and kayakers. During your visit, enjoy a canal boat ride with Lil' Diamond III at the Herkimer Marina. Go through a lock that lifts you up and down 20 feet on the Erie Canal. Cherish your heroes at Cooperstown's Baseball Hall of Fame. Join in the many activities during Herkimer Diamond Mines' 62nd anniversary. Pool: Memorial Weekend - Labor Day Weekend. Max pull thru: 100 feet.