Apologies for wasting your time with this post. Please disregard it.
My temporary plan is to meet together daily at one of the BART stops (Ashby or Berkeley, probably Ashby at first), choose a random set of directions, walk for 30-45 minutes, and then find a place to sit and chat for a while about other activities. Then walk back and split up. Total time may be 2-2.5 hours, 1-1.5 of it spent walking. I'm planning on doing this in the evening to avoid the midday heat, and to be done before it gets dark.
Anyone that wishes can come along. If you would like to bring ideas for future format or training ideas, please do! Together we can come up with things that enhance us all.
Edit - forgot to add location! Thanks for reminding me, Randaly.