hi, no a folding bike is not an option for me sadly.
im going to be around 25th and judah - i'm right by the enterance to the park.
also - i dont know what the 'wiggle' is and maybe it could help me? it's tough because im still in the east bay right now and want to figure this out so badly but can't go riding for a few days in the city
the thing that kindof makes sense about going through the presidio is that my destination is right off of bay street - a fairly north east part of the city. so it kindof makes sense to go north for a while.