Rudy, we'll probably do the same again this year. We have friends in Santa Rosa and they have invited us again if we want to go. Last year we were at Tahoe with DS and his family so this time I would like to do some more cycling as it wasn't practical with a one year old. A couple of years ago we stayed north of LA for a couple of days and then drove down towards San Diego - I love the PCH, I kept on making DH stop every, so it seemed, hundred yards or so, as I was drooling over the marine life. I was beside myself when I saw a pair of dolphins swimming along parallel to the shore. The only place which you mention that we haven't visited is Yosemite.
I am quite taken with the idea of Umbria now - watch this space.
On a S & B note, we decided to go to the Metro Centre this afternoon so we could have a walk in the dry (dragged DH along). We actually went into Debenhams to have a free tea/coffee with our DT subscription and ended up buying - in my case a lovely dusky pink trench mac, and in his case a thick waterproof jacket suitable for all winter weather, a shirt and a sweater. I felt quite virtuous as he spent more money than I did.