Yes, most definitely, I also fly my drone along SR-1 in NorCal and seagull will attack your drone within minutes. If they attack your drone you can either fly up several hundred feet or RHT.
Treasure Island has a drone school, so you can fly legally from Treasure Island, also Bayland Park and César Chávez Park are where a few UAV meets to fly every two weeks.
Yes, seagulls and pelicans are very protective around their nesting ground. I had the same experience, so what I did was fly above them, at least 300 ft and at that distance they are highly unlikely to attack.
Thanks for this very important post, try using a Trackr on your drone so that you can track it down when there is a total power lost. Trackr are 30.00 and are very good at locating lost objects like keys, ect.