Pier 39 in San Fran is pretty cool to stop and see the sea lions, you can grab a realllly good lunch at the Fog Harbor i think its called. Yosemite is worth spending a day at, it is one of the treasures of the world, amazing place. Barry White is kinda out of the way from where youre going(a bit northeast), but still a cool place. Ironworks is in Bakersfield I think and thats on your way to vegas. In LA Universal City Walk is pretty cool. You can stop by Burbank too and eat at bobs big boy on a cruise night if the dates line up, and take a studio tour of NBC studios. A drive up the pacific coast highway is pretty cool too, theres plenty of cool beaches if youre into that kinda thing, stop and eat in malibu, home of the $5.50/gal premium gas
Oh, and what happens in Vegas, well, it stays in Vegas.