Paradise Cay, also known as County Service Area No. 29, is an unincorporated enclave, surrounded by the town of Tiburon in Marin County, California, United States, located 2 miles south of Point San Quentin at an elevation of 23 feet. The waterfront community lies at the foot of the Tiburon Peninsula south of Corte Madera Creek along the …Paradise Cay, also known as County Service Area No. 29, is an unincorporated enclave, surrounded by the town of Tiburon in Marin County, California, United States, located 2 miles south of Point San Quentin at an elevation of 23 feet. The waterfront community lies at the foot of the Tiburon Peninsula south of Corte Madera Creek along the San Francisco Bay. The community is in ZIP code 94920 and area code 415.