Plan an unforgettable stay for a group of up to 8—and a dog or 2—at Harbor House, a spacious waterfront home with a hot tub & private dock where the Rock River emerges from 10,000-acre Lake Koshkonong offers a world of water sports—boating, kayaking, paddleboarding & more. Battle on 3 classic arcade games or ping pong table in the heated game room, gather at the firepit 12 steps from the water, and grill & dine on the deck overlooking the water. Close to Madison & Janesville.