Exploring Kagawa Prefecture.
#Takamatsu.

Located on the island of Shikoku, Takamatsu is largely overlooked despite there being plenty to see and do including waterfront strolls, gardens, castle ruins, and temples.
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Highlights - Takamatsu Station: Alight at Takamatsu Station for Takamatsu Symbol Tower (pictured), Sunport Fountain, Tamamo Pier Lighthouse, and Takamatsu Castle Park.
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Highlights - Ritsurin-Kōen-Kitaguchi Station: Alight at Ritsurin-Kōen-Kitaguchi Station for Ritsurin Gardens.
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Highlights - Kotoden-Yashima Station: Alight at Kotoden-Yashima Station for Yashima Shrine, Shikoku Village, Yashima Temple and Shishi-no-Reigan Observation Deck (via Yashima-Sanjo Shuttle Bus).
#Kotohira.

Lying just over a half hour by Shinkansen from Takamatsu is the town of Kotohira. The town is not only easily accessible for those wishing to take a short day trip out of Takamatsu but is also home to the impressive Kotohira Shrine.
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Highlights: Kotoro > Konpira Omotesando > Kotohira Shrine > Goriyakuya (souvenir/gift shop).
#Utazu.

A short train ride from JR Takamatsu, Utazu is home to a few places of interest, including Sorakin, an observation tower where one can enjoy the views through a series of fish tanks that also operate as windows.
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Highlights: Shikoku Aquarium, Sorakin (Sky Aquarium of Gold - pictured), Aonoyama, Gōshōji Temple, Ubushina Shrine.