A decent onsen with some jacuzzi-style baths inside and a rotemburo (outdoor onsen). There is a hotel here, too, for those who really want to relax.
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湯迫温泉
"Temporarily Closed" Despite being within the city limits, this onsen is not well known even by locals. Although the exterior leaves much to be desired, inside is a genuine hot-spring with good facilities and a variety of baths. The onsen is part of Hakuunkaku Ryokan, but visitors can come and enjoy the onsen without staying at the ryokan.
招き猫美術館
A museum devoted entirely to the famous good luck cats seen in many shops and restaurants throughout Japan.
アニモ・ミュージアム
法界院
One of the temples of the Chugoku 33 Kannon Temple Pilgrimage. It's a short distance from Handayama Botanical Garden.
岡山市半田山植物園
A botanical garden filled with various types of flowers. It's particularly beautiful during the spring cherry blossom season; however, one can easily enjoy this garden anytime of the year. It's a 10-minute walk from Hokaiin Station on the JR Tsuyama Line. There are also buses from JR Okayama Station.
曹源寺
A large Zen temple at the base of Mt. Misaoyama at the end of the path between Tendai-ji (right side) and Daiko-in (left side). It is a well known place for western Zen students. Free meditation sessions from 08:00-09:00 most Sundays are usually followed by a simple tea ceremony. The garden behind the temple is famous for having one of the largest cherry blossom trees in Okayama and a lake which beautifully reflects the tree and the surrounding countryside. This garden was designed by the same architect who built Korakuen. Although the mountain is near the center of the city, the area around it maintains a rural atmosphere. It can be very pleasant to hike over around this hill and visit the various small temples and shrines. If Zen meditation at Sogen-ji gives you a backache, you can relieve your aches and pains at a ganban onsen (rock hot spring.) This style of hot spring does not have a large bathing area but instead has gravel and hard rock beds where steam passes up from under you or down from above like a sauna.