If you've had it with ordinary merchants, visit the home of this family of retired samurai who went into business in Kurashiki.
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倉敷市立自然史博物館
Local flora, fauna, insects, and geology; the star attraction is a Naumann's Elephant, a giant prehistoric mammal from southern Japan.
大原美術館 Ōhara bijutsukan
The first museum of Western art in Japan,it houses a deservedly renowned collection of classic European and American art, including major works by Picasso, Renoir, Monet, Matisse, and many others. There's another building for exhibitions by modern Japanese artists, which tend to be very good. Set aside some time to wander the grounds as well, with Rodin statues out front, a small sculpture garden out back, and neoclassical columns beatifically out of character with the rest of the area.
倉敷市立美術館
Exhibits of work by artists from Kurashiki, with a focus on the renowned painter Yoson Ikeda (1895-1988). The building, designed by Kenzo Tange, is an odd attempt to reinterpret warehouses of the Bikan area in concrete.
倉敷民藝館
Hosts excellent seasonal and permanent exhibitions of Japanese folk crafts. Even if you're not captivated by the subject matter, the space in which it's housed — three vintage structures connected by narrow corridors and old stairwells — is worth checking out.
倉敷考古館
Housed in a particularly lovely old rice warehouse, this museum has Japanese, Chinese, and even Incan artifacts on display.
日本郷土玩具館
A collection of over 40,000 toys, although only 5,000 or so are generally on display. Most are show-pieces (and occasionally eerie ones at that), but there are some that kids can play with hands-on.