About 5km east of Takamatsu and highly visible from the city is the 292m-high tabletop plateau of Yashima (屋島), where you'll find Yashima-ji, number 84 of the 88 Temples. Yashima, meaning 'roof island', is a peninsula of lava and is part of Seto-nai-kai National Park. There are great views over the Inland Sea and Takamatsu from various viewing spots.
Just to the east of Yashima and still in Seto-nai-kai National Park is Goken-zan, the mountainous stony peninsula that attracted Isamu Noguchi to live here with a source of stone for his sculptures. Here you'll also find Temple 85, Yakuri-ji and a fun retro cable car.