Third Street is a moderately epic street that starts at Market, heads south east through SoMa, and then hooks due south through China Basin where it picks up the T-Third and continues through Mission Bay, Dogpatch, Bayview on down to and merges with Bayshore Boulevard.

As a result, there are some pretty weird intersections like 16th Street and 3rd Street. 

Things on Third Street:

• UCSF Mission Bay
• Serpentine
• Mr. and Mrs. Miscellaneous
• lots of parking facilities for the tour rides that operate in the rest of the city (e.g. Ride the Ducks and the fake cable cars)
• ...