About 5km northeast of the town is the 112m dormant volcano Kasa-yama. The top has gorgeous views of the Sea of Japan, and a tiny 30m-deep crater. There is also a walking track around the coast. From late February to late March a beautiful grove of camellias blooms here.
The pond at the mountain's base, Myōjin-ike (明神池), is connected to the sea and shelters a variety of saltwater fish. Look and listen for birdlife in the surrounding trees.
About five minutes' walk up the mountain from the pond is Hagi Glass , where quartz basalt from the volcano is used to make extremely tough Hagi glassware. The showroom and shop display beautiful coloured vases, and you can watch the glass-blowing process. Next door is Hagi's own beer and citrus-juice factory, Yuzuya Honten . Stop in here to see the very small team at work, taste juice in the attached shop, or have a refreshing mikan -flavoured (satsuma) soft cream.
Buses go to Kasa-yama from Higashi-Hagi Station once every hour to 1½ hours (¥280, 15 minutes); get off at the Koshi-ga-hama stop, about eight minutes' walk from the base of the mountain and Myōjin-ike.