A car is usually pretty optional for most places in Europe. Some natural areas like the Alps have better public transit than most US city centers. Not everywher

A car is usually pretty optional for most places in Europe. Some natural areas like the Alps have better public transit than most US city centers. Not everywhere is as allergic to public transit as most of the US. SF is also one of the better US cities in this regard. I spent several months in SF without a car and rented a car exactly one weekend to get to some further out hiking. There are actually plenty of transit accessible natural areas.