We also checked out the San Francisco Zoo on Monday with friends- and what a wonderful adventure it was! All of the kids (4mos-3 years) had an absolute blast. Taking 280 from Los Altos, it was only about a 40 minute trip (leaving at 9:45, possibly due to Spring Break?!) I highly recommend purchasing tickets online in advance so you don't have to wait in line (being on the coast, it gets quite cold and windy!) Adults are $20, children under 3 are free! Parking is $10 - but note there are tons of discounted/reciprocal memberships so be sure to check it out!The highlight for the kiddos was probably the train ride, but they also loved seeing the tigers, penguins and growling guerrilas! Easy to stroll around, bring your own or use one of their rentals. Remember to bring extra layers, it was windy!!