Lets talk about trees. Now, it would be a total lie to say that I travelled across the world to examine different eco-cultures, but appreciate what nature has to offer up there? That I can get amongst! Outside of San Francisco, we compensated for missing our tour to Yosemite with an, albeit smaller, but still impressive national park.
Travelling in foreign cities usually necessitates at least some sort of involvement with tour companies, be it for a day, week or month. In a city like San Francisco, where the main industry is tourism, you will be presented with an insane number of options for tours.