© OpenStreetMap contributors
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.
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.
岡山県総合グラウンド
The Multipurpose Grounds contain a wide variety of sports facilities, including a pool (only open in July and August), tennis courts, a baseball field, gymnasium, and track and field area. It is also home to City Light Stadium where the J-League soccer team Fagiano Okayama plays. Other local teams and university teams also use the facilities. If you're interested in watching sports, check the schedule of events. There is also a small Sports Museum near the stadium. The phone number listed here is for the stadium however, each facility has its own phone number. If you need to contact a specific facility, check the website for its number.
吉備路文学館
Displays of original works and transcripts from famous authors from the Okayama area. It helps to have Japanese reading ability and an interest in Japanese literature, of course. It's just north of the city center, a couple blocks east of the Nishi-gawa Canal.