The San Rafael Bridge is a roll of dice. Timing can be everything, even on weekends. Same with Hwy 101 in the vicinity. Traffic can back up horribly. Then returning on a loop trip headed back over the Bay Bridge and freeway can be even worse! Whatever direction you go, I strongly recommend crossing any necessary bridges mid-morning, around 10:00 AM, then staying in Marin County till after the evening rush hour, and returning after 8:00 PM. There will be plenty of things to do, and good places to eat etc. For example, hang around Pt Reyes Station when you're done shooting. Trying to fight traffic can be exhausting even if you've learned a few shortcuts. Not worth it on a vacation. Find a destination and relax. I personally regard Sausalito as a tourist trap, and am thinking more of quieter areas well away from Fwy 101 cities, along Hwy 1.