Tokugawa Museum is 1.5 mi (2.4 km) from central Mito, why not stop by during your stay. If you want to experience more of the culture Mito has to offer, head to Kairakuen Park, Tokiwa Shrine, and Senba Lake.
You might want to get your camera out and head to Ibaraki Prefectural Observation Deck— just one of the landmarks located 2.2 mi (3.5 km) from central Mito.