There is not much around to help. I did find this:
“I don’t know about rentals, but Zach Kaplan in Alameda will let you go on very long test rides. He charges a nominal fee for it.
Zach is a good guy and a very knowledgeable recumbent dealer with a great selection of ‘bents. I bought an Rans Rocket from him a year ago and love it.:)
Good luck, rich
Zach Kaplan Cycles
1518 Buena Vista Ave.
Alameda, CA 94501–1218 USA
510–522-BENT (2368)
zakaplan@earthlink.net (zakaplan@earthlink.net)”
This place in Los gatos rents them, but you may have to use them there:
Vasona Lake County Park
4 star rating
based on 65 reviews
Rating Details ยป
Category: Parks [Edit]
333 Blossom Hill Road
Los Gatos, CA 95032
(408) 356–2729
www.sccgov.org/portal/site/parks…