The getaway is on the banks of the Sugumo River, just a 45-minute bullet train ride from Tokyo. There are almost 50 rooms, outfitted with chic modern tatami mats. On-site, there’s also a dining room serving fresh sashimi from the nearby Pacific Ocean and a cozy library, with about 100 books. Hakone, in the Kanagawa Prefecture, is famous for its hot springs at traditional ryokans.