116 Portsmouth Drive sits at the end of a quiet cul-de-sac in Hamilton's Sunny Cove neighborhood, offering a rare combination of privacy, natural surroundings, and thoughtfully upgraded living. Backing directly to protected open space with direct trail access from the property, the setting feels peaceful and removed while remaining close to Hamilton's parks, Bay Trail paths, shopping, dining, and commuter options. Originally selected by the original owners during the neighborhood's development for its unique side yard and connection to open space, the property offers a setting rarely found within Hamilton where nature, privacy, and neighborhood living come together seamlessly. Spanning approximately 2,390 square feet, the residence features 4 bedrooms and 2.5 bathrooms with a functional floor plan designed for comfortable everyday living. Fresh interior paint, new flooring, updated light fixtures, and refreshed landscaping provide a clean, move-in-ready feel throughout. Natural light fills the home throughout the day, while the main living spaces include a spacious family room with fireplace, generous gathering areas, and seamless access to the fenced backyard and surrounding greenery. The connection to the outdoors is felt throughout the property, with mature landscaping, open sky views, and a staircase pathway leading directly from the side yard into the trails and open space beyond. Upstairs, the primary suite offers a large walk-in closet and soaking tub, while upper-level rooms capture views toward the San Francisco Bay Trail. The home has been extensively improved with a focus on comfort, efficiency, and long-term sustainability, including owned solar with Tesla battery backup, upgraded HVAC systems, EV charging infrastructure, updated insulation, and energy-conscious improvements throughout. Additional features include an upstairs laundry room, two-car garage with installed workspace storage systems, outdoor storage shed, and an extra-long driveway with parking for multiple vehicles. Hamilton remains one of Novato's most desirable communities for its waterfront trails, parks, commuter accessibility, and connected outdoor lifestyle.