21 Underrated National Parks for Avoiding Summer Crowds

18. Biscayne National Park (Florida): An Underwater Escape

Just south of Miami lies a National Park that's 95% underwater, making it a perfect summer escape if you have boat access (personal, tour, or rental). Leave the crowded beaches behind and explore vibrant coral reefs teeming with fish via snorkeling or diving. Paddle through serene mangrove shorelines by kayak or SUP, or explore the fascinating maritime heritage around Boca Chita Key. While summer brings heat and potential rain, the water focus naturally disperses visitors, offering a unique aquatic wilderness experience close to a major city.