Bike Touring From SF to Santa Barbara

Never done it before.  Biking long distance is something I've been always thinking about.  Life is short (I am talking about theirs :), so let's not waste anymore time.  Thinking about doing this in the beginning of November.  I still have a little more than a month to do the planning. 

378 mi., 35 hours. 10.8 mph.  Realistically, I am thinking 50 miles per day, which means it should take about 8 days to get down to SB.  The most I did is 60 miles/day around part of the Bay Area.  Hm... how many extra tubes should I bring?  What else to bring?  More on that later.  

11/6/2012 Update:  I've done a lot of planning, I am physically and mentally ready, my Marin Muirwoods is also ready, I am pumped, BUT!  Urgh... something important came up.  Tour cancelled for now.