Kenrokuen is the major tourist attraction in Kanazawa, Ishikawa prefecture.
Kanazawa used to be the capital of Kaga province, one of the richest provinces in Edo era, when Tokugawa shogunate ruled Japan. Kaga province was ruled by feudal family Maeda at that time.
There are three best parks in Japan. Kairakuen in Mito, Korakuen in Okayama and Kenrokuen in Kanazawa. By the way, "EN" means garden or park in Japanese.
Before opening of Hokuriku shinkansen, it is quite far or inconvenient to travel to Kanazawa from Tokyo. 60-70% of the tourists had to take flights from Tokyo-Haneda to Komatsu airport which is approximately 30 km away from downtown Kanazawa. The rest of the tourists took trains, either via Echigo-Yuzawa on Joetsu shinkasen or Maibara stations on Tokaido shinkansen.
Now Hokuriku shinkansen's Kagayaki train connects the capital and Kanazawa in 2 hours and 30 minutes. Which means full day excursion from Tokyo to Kanazawa is possible.