29,[2] is an unincorporated enclave, surrounded by the town of Tiburon in Marin County, California, United States,[1] located 2 miles (3 km) south of Point San Quentin[3] at an elevation of 23 feet (7 m).

[1] The waterfront community lies at the foot of the Tiburon Peninsula south of Corte Madera Creek along the San Francisco Bay.

[6] Paradise Cay is situated close to Triangle Marsh, a location of considerable biological productivity.

To the south is the Tiburon Peninsula, which is dominated by Ring Mountain; Ring Mountain itself exhibits extensive floral biodiversity and also manifests extant Native American petroglyphs.

Federally, Paradise Cay is in California's 2nd congressional district, represented by Democrat Jared Huffman.