Lucky 13 - 8/28/15

With today's California puzzle I'm taking the opportunity to wish my friend The Rat congratulations on 13 years of geocaching.  In honor of the occasion he's having an event this weekend at which he'll be sharing "some VERY STRONG hints" for some of his puzzle caches. Sounds like a fun event in a pleasant, accessible location ... so you won't need to break out the:

4 X 4

Tomorrow we'll ...