I grew up in Tiburon and it used to be a monthly treat to drive over the Mill Valley Library. The selection was huge (at least comparatively) and the building is cool -- kind of set back in the trees. We used to love the adjacent playground, too. Parking was always trouble -- we'd have to hike in a bit from the nearby neighborhood, especially if something was happening at the school across the street.
Pros: Cool building
Cons: Tough parking
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