A rare offering on the historic Idlewild section of Cow Island, this exceptional Lake Winnipesaukee retreat combines privacy, expansive waterfront, and outstanding amenities. Set on five private acres with approximately 540 feet of protected shoreline along peaceful Orchard Cove, the property features a 40-foot U-shaped dock and a 6 by 30 foot single dock; ideal for swimming, kayaking, paddleboarding, and relaxing by the lake with plenty of docking for guests. The three-bedroom post-and-beam home is filled with timeless island character, including cathedral ceilings, wide-pine floors, a fieldstone fireplace, and an open-concept kitchen, dining, and living area with beautiful water views. A spacious screened breezeway creates a seamless connection between the lake and surrounding woods while providing an inviting space for dining and entertaining. The main house includes the primary bedroom and a full bath, while a separate guest suite offers a bedroom, three-quarter bath, and additional loft sleeping area (your guests will never want to leave). A charming waterfront bunkhouse provides even more accommodations for family and friends. The open backyard offers ample space for games and recreation, including a disc golf area. A 16-by-16-foot entertaining space was also designed to accommodate a future private wing. Ownership includes deeded access to approximately 42 acres of common land, two sandy beaches, a pickleball court, baseball field, recreation building, and a one-mile walking trail leading to the former main site of Camp Idlewild, where original camp features remain for association members to enjoy. With guaranteed mainland access nearby, extensive waterfront, generous acreage, and remarkable privacy, 138 Cow Island represents island living at its finest.