Kairaku-en is one of three Great Gardens of Japan along side with Kenroku-en in Kanazawa, Ishikawa Prefecture and Koraku-en in Okayama. In Edo period, July 1842 , Tokugawa Nariaki was 9th prominent Japanese daimyō who ruled the Mito Domain; he built this garden for his people as a great relaxation place. Kairaku-en is about 3,000,000㎡, about 64 times bigger than the Tokyo Dome. It is the second largest public park after the Central Park in NYC. Visitor would be able to see moso bamboo trees after passing the main entrance. There are the old healing water fountain and Koubuntei which is a small cottage built by , Tokugawa Nariaki himself. There are about 3000 plum trees, which can be divided into 100 different groups. From the end of February to the end of March, they would host the Plum Festival. From April, the cherry blossom season would start as well as rhododendrons would be opening up. Bush clover would be nice during autumn; early winter, visitors can see cherry blossom as well.
The opening time is 7:00 to 18:00, from 1st of October to 19th of February. From February 20th to September 30th, the opening time would be 6:00 to 19:00. The garden is opening all year around. The entrance to the garden is free. However, entering the small cottage would be ticketed: 200 yen for an adult and 100 yen for a child age 6 to 15.