I'm staying at the Hilton Harbor Island Drive. I have already booked a 2-day trolley tour with on and off privileges. I have also book a harbor cruise. There are three other things I'd like to do but don't know if I would need a car or could take trolley, bus, train, etc. I'm interested in La Joylla Cove, Point Loma (how much walking is involved with each of these?) and the Wild Animal Zoo, which I know is about 30 miles away. I can't afford a 30-mile cab, so are there any other options? Thanks in advance.