Team in Training does the AMBBR - provides a full training plan (you do have to fundraise, but it is a relatively modest amount for this ride as it's sort of local. There's an informational meeting at the Mill Valley Community Center on 1/20 at 10 am. The Redwood Wine Country team trains in Sonoma, Napa and Marin counties and is just a great group. I am a coach for the team, but not for this particualr evemt, so I am biased.