Wow - impressive! Great job.
I am somewhat familiar with this area, and I think it looks excellent - esp the hillshading (good light/darkness balance).
1. Incorporate veg coverage into relief tinting - show where the oaks and grass are. If you do this you will make the map more useful to a larger market: naturalists/hikers/biologists. Should be some very good sources of info on this from FRAP
and Bay Area agencies.
2. Use CA highway markers (available in ESRI Transportation style).
3. For protected areas, instead of cross-hatching, designate by border, maybe a inner-buffered effect (stay with green color of course).
4. I esp. like the tapered text on the bottom-left.
Can you give us some info on the map story (production hours, etc.). I got the jist from the 'about map' blurb.
Thanks for sharing - keep us posted. Chris