We'll be in San Diego for 2 days this summer. We'll be staying close to the convention center as my husband has a conference there. But my daughter and I want to tour around and do some stuff. I just came across the website for the old town trolley. Is that a good option for us to get around to see stuff? I'd prefer not to drive if possible. We want to do one day at the zoo. But not sure what to do for the other day / half day. Can anyone give more info about the trolley? Where does it pick people up and where does it go? Does it go to the zoo? And am I correct to think we can just get on and off wherever we want all day?