Kanazawa is often called Kyoto without the crowds, which is a lazy comparison. Kyoto was the emperor's capital. Kanazawa was the seat of the Maeda lords, who ruled the Kaga Domain from here for 14 generations and, instead of building an army, poured their money into gardens, lacquer, ceramics and gold leaf. Before them a Buddhist league ran the province as a self-governing "Peasants' Kingdom" until Oda Nobunaga's generals broke it in 1580. Most of the samurai, merchant and geisha streets that followed still run where they did in the Edo period.
It is compact, wet and good to eat in. In November the pines in Kenroku-en are being tied into rope cones for the snow while the first snow crabs land at Omicho Market. Three days is the right length: day one is the garden, the castle and the museum, day two the market, the samurai quarter and the geisha districts, and day three the thatched farmhouses of Shirakawa-go. Any more and you are padding.
Start on a Wednesday. The 21st Century Museum and several small museums close on Mondays, Omicho shops set their own closing days, often Wednesday or Sunday (so the market lands on Thursday), and Shirakawa-go falls on a Friday, calmer than a weekend. The Hokuriku Shinkansen takes about 2.5 hours from Tokyo (see our Tokyo guide), and from Kyoto you change at Tsuruga (see our Kyoto guide). More on the country is on the Japan page.