Exceptional waterfront living awaits at 129 Caribe Isle, a beautifully maintained and extensively improved single-level home in coveted Bel Marin Keys, where nearly every inch of the property has been thoughtfully considered inside and out. Ideally positioned along a quieter no-wake section of the lagoon, the setting is perfect for kayaking, paddleboarding, swimming, and enjoying life on the water, with the faster boating area just a buoy away. Inside, generous room proportions, abundant natural light, and oversized sliding glass doors create a seamless indoor-outdoor connection. The inviting living room flows directly to an extraordinary waterfront entertaining area, while the spacious primary suite enjoys its own oversized slider and beautiful lagoon views. The well-appointed kitchen features high-end stainless steel appliances, including GE Cafe and Miele, while the easy single-level floor plan offers generously sized bedrooms and updated baths. A two-car garage provides additional everyday functionality. Outside, a substantial travertine patio extends the living space toward the water, complemented by a custom covered outdoor living area with recessed lighting, built-in speakers, and ceiling fan, plus a hot tub, fire pit, water feature, drought-tolerant landscaping, and private dock. From morning coffee to sunset gatherings, the backyard truly functions as an extension of the home. An expansive paver driveway and generous gated side yard offer fenced-in boat or RV parking and additional recreational flexibility. Beyond what meets the eye, extensive improvements include drainage and sewer work, updated plumbing, electrical service, windows, insulation, HVAC system including central A/C and ductwork, roofing, landscaping, hardscape, and more. The home has also been leveled, a significant improvement that contributes to notably level floors throughout. With sunset views, direct lagoon access, and truly move-right-in condition, 129 Caribe Isle offers an exceptional opportunity to immediately embrace the BMK waterfront lifestyle.