Excellent West Coast view on modern art
Not being an art buff, I depend on a museum to be not just fun, but also informative, and provide some explanations along with the art. SFMOMA does this excellently; their audioguide is excellent, and in fact calling it an audioguide is doing it an injustice, with videos and interactive features alongside good audio explanations.
The collection itself is first-class, as you'd expect, and really gives a good overview of not just modern art, but what's distinctive about the West Coast flavour of it; especially the current 75th anniversary exhibition. Just be prepared to spend quite a while there - it drew me in for the entire day!