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Fuji-Hakone-Izu NP, Tokyo
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After swimmers leave, Akazaki’s wooden paths become a stargazing spot. Kozushima earned Dark Sky Park status in 2020; that May and June, more than 400 street and road lights were replaced with night-sky-friendly fixtures.
Akasaki’s roughly 500m wooden walkway doubles as a diving course: Tokyo’s park authority describes a 3m jump platform and even leaps from the middle of the rope bridge into the sea.
The cove is a beginner dive site about 6m deep, with little current, naturally growing coral, schools of small fish and tiny marine creatures. It’s a lively underwater world tucked beneath the walkway.
Just south of the promenade, old trolley traces mark a former export route: fire-resistant stone came down from Kobe-yama by ropeway, then cart to the shore. Quarry transport by road continued until spring 2000.
The cove is nature-made: waves have eroded Kozushima’s volcanic shoreline into inlets, including Akasaki. The island’s coastal rocks include rhyolite lava, giving this sheltered swimming spot its rugged volcanic setting.
From the promenade’s lookout, the sea horizon is only half the show: on clear days, visitors can see northern Izu islands, Mt. Fuji and even the Southern Alps.
