Travelers are voting Angel Island and Alcatraz Island as the best islands near Mill Valley. There are 2 islands near Hayward a city just 30 km from Mill Valley and 2 islands near San Carlos City which is 30 km distant. The most popular of these are Angel Island near Hayward and Alcatraz Island around San Carlos City. You can find 9 islands near California and 143 islands in the country of United States. Our members favorite in California is Alcatraz Island and Angel Island is the top pick in United States. Want more? Check out our map of islands near Mill Valley.