If you're in San Diego and don't have a vehicle, try the San Diego trolley. There are at least three different lines to choose from that will take you to different parts of San Diego.
The newly introduced Green Line that provided a new underground tunnel and station that stop at San Diego State University is state of the art and definitely worth the trip. This same line takes you all the way to Old Town with stops in between at the malls and Qualcomm stadium.
With the addition of the Green Line some brand new trolley cars came on board. They are magnificent and have to be seen. Depending on what areas of town you're going to, the clientele might be a little interesting so be careful.
Pricing is not bad and monthly and semester passes are available.
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