Flying into San francisco, trying to figure out the best route to hit San Francisco attractions, see Redwoods at Henry Cowel and then Napa. We are here for 6 nights. Should we drive straight down to Santa Cruz from San Fran, stay one or two nights? then head up to San Fran, spend 3 nights, and then spend the last two nights in Napa? Just trying to figure out the best course of action and how many days are really needed in each city. Thanks in advance.