Evidently, I'm very, very late to the party on this one. I just spotted the picture above on Strava the other day, and did some research.
The notion is that riders can take a bell, and either keep & use it, or drop it back in the box when they finish their ride. There are evidently several boxes in the Simi & T.O. area, placed by the Conejo Open Space Foundation in partnership with Conejo Open Space Conservation Agency and Concerned Off-Road Bicyclists Association, who are providing the bells. (The note from CORBA is here.) And a bit of searching turned up a note indicating that SHARE MTB Club is doing something similar here in O.C.
I'm of two minds in my reaction to this. I think it's a great idea, and encourages good behavior. But I also think the communication surrounding the bells needs improvement.continued