Hey Ula guidesSan Francisco travel guidesHomeGuidesNorth AmericaUnited StatesCaliforniaSan FranciscoFree Muni for 18 and under, cable cars free at 4 and under and a cool, mild climate.Family travelSan Francisco · With kidsSan Francisco with kids: things to doSan Francisco with kids: free Muni for 18 and under, cable cars free at 4 and under, museum child prices and a month-by-month weather table.