Free Activites Abound in California.  Below is a list:

CAUTION - annoying and possibly invasive popups may appear in these links!

 

All of California

Free Things to do in California

 

San Francisco

Free Things to do in San Francisco  A nice list of local parks and other free attractions.

San Francisco City Guides Free walking tours of San Fran.

 

San Diego

Six Free Things to do in San Diego Parks, beaches and other suggestions.

 

Santa Barbara

Things to do in Santa Barbara Parks, beaches and the waterfront.

 

Los Angeles

Huntington Library Library, art collections and botanical gardens.

 

Redwood National Park - Located in the far northwestern section of California, Redwood National Park offers a variety of free activities:

http://www.tripadvisor.com/Travel-g21...

 

RNP - Free things to do