Usami Onsen

Coastal Izu resort with a long Edo-period bathing history. Famous for the wooden Tokaikan inn, sodium chloride springs, and fresh sashimi at the morning market.

Seaside city on the Izu Peninsula, an hour from Tokyo by Shinkansen. Coastal sodium chloride springs; fireworks over Sagami Bay in summer.

A planned highland resort above Ito on the eastern Izu Peninsula, laid out in the 1960s on lava from Mt. Omuro, with mild simple-thermal springs, sea-view open-air baths, pensions and small art museums, the Jogasaki Coast, and a cherry-blossom avenue.

Quiet Kanagawa onsen in the foothills of the Hakone outer rim, on the Manyoshu-era list of historic baths. Plum blossoms in February.