San Francisco is one of the most expensive cities in USA and it can get even more expensive if you are travelling with kids and don’t have a proper plan. We visited SFO with our 1 year old son and trust me, we all had a lot of fun without even getting tired.So here’s the list of FREE things we did during our visit to San Francisco. 1.Golden Gate Bridge : If you are visiting SFO then there is no way you can miss this beauty even if it costs you few bucks . But luckily you can watch marine life, stroll or can stay on the bridge for an entire…