Well having read the above posts I am feeling quite jealous about the time you all get away and, even worse, feeling guilty that I own such a great camper but may only get a handful of days away in a year!
I bought the Cali for three reasons. First, because I like driving it more than anything else I have owned - it's now my main vehicle. Second, I got it to use as a day van for outdoor photography - it's perfect for this. Third (and yet to be tried) I got it as a 'warm room' for astronomy. The idea is that I drive my telescope a few hundred yards into my wildflower meadow where I can get an unobstructed view of the sky, set up the telescope outside and wait a couple of hours for it to cool down. The Cali will keep me warm and fed, house all the techie astronomy equipment and a Cali dog or two, and provide power for the telescope. When the clouds roll in (as they usually do) there will be another couple of hours delay.... So in a year I may clock up a lot of 1/2 nights 100 yards from home - I'm not sure if this counts in your survey!