The San Diego Museum of Art features, in my opinion, the greatest selection of art. The pieces are very ecletic and range from great impressionistic pieces to contemporary and cubist art. They have several rotating exhibits that change ever three or four months, and I make an effort to see each new one as it passes through. Admission is free on Tuesdays, but if you can't make it that day (it's usually really busy anyway, especially during the summer), it's well worth the price to stop in anytime. It's a great first exposure to art for children, as the museum is more child-friendly than most.
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