One of my favorite places in LA is the Norton Simon Museum in Pasadena. It has a small and intimate art collection (read: manageable and not overwhelming) and hardly ever gets crowded. What makes this place a real gem, however, is its extensive Asian art collection (above and below). The bottom floor is devoted almost entirely to art from South and Southeast Asia. What's more, the space suits the collection beautifully-- it is very peaceful and spare, with lots of natural light.