Many San Francisco attractions that charge admission allow non-paying visitors into their lobbies, including Coit Tower with its WPA mural, the de Young Museum with its 9th floor tower featuring panoramic views, and the SFMOMA with its 213-ton lobby sculpture by Richard Serra. Also, many spectacular annual events are free. Note that free admission policies sometimes change, as do free days and times. Do check at the attraction’s website to confirm. And do consider becoming a member of your favorite museums, as that often allows you and your family free admission and to participate in free days and events especially for members.