Any San Diego local will tell you that traffic here is a headache and that you can't really expect much from public transportation. However, that has changed in the last couple years with DecoBike Stations, so really this is a local's secret- but I'm sharing it here for you!
These bicycle rental stations have been popping up all over the city over the last couple years and have made getting around the city a lot more convenient and fun. Especially for those who like to get out and explore a new city via bicycle!
Basically, you just pick up a bike at any station on the map and pay the rental fee there at the kiosk.
These bicycles are great for getting around the city- otherwise you are going to be walking or taking the bus system, which hasn't yet been perfected for visitors quite yet!