Yes, the Marina does live up to its reputation of extraordinarily high ratio of yoga pants and blondes (natural and otherwise - brunettes, please check with marina immigration control to get cleared beforehand).
It is also home to many cool people, some of the best running scenery in SF...not to mention the best margarita in SF (no, not the bar we are going to).
I'll buy a beer to anyone who actually goes blonde exclusively for this event (before/after photo evidence required). BTW, mine is natural.
The bar is a good crusty corner of the otherwise non crusty Marina. Please don't disturb the bar files.
Think GG Bridge, think flat out SPEED. Head to the water...zoom, then back. If you want to add a mile or so, to go to Ft. Point before rejoining the chalked route.