The CVC leaves sidewalk regulation to cities and counties, so check your local ordinances. Many cities will prohibit cycling on sidewalks in "business districts" where there are lots of pedestrians.
The legality of crosswalk cycling in currently ambiguous - it could be argued legal or illegal depending how you read the vehicle codes. FYI, I have heard that Berkeley police consider crosswalk (edit: I previously said sidewalk by mistake) cycling illegal. So if you get hit by a car while riding in a crosswalk in Berkeley, don't expect a favorable police report.
(See edit above.)
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Last edited by LCI_Brian; 01-12-06 at 10:40 AM.