A cross between a ryokan and a yacht, this floating hotel has 19 luxurious cabins and sets sail from Onomichi in Hiroshima prefecture before cruising around Japan’s Seto Inland Sea. The boat’s warm, wood-paneled interiors—designed by architect Yasushi Horibe—give the small hotel an inviting vibe, but the best benefit of setting sail on the Guntu is easy access to the sea’s over 700 islands. Onshore activities range from a visit to Naoshima, an art-filled island that’s home to Yayoi Kusama’s famous dotted pumpkins, to sampling soy sauce at a local brewery to excursions with local fishermen. There are more than 10 sailing routes, from one to three nights, and cabins start at approximately $3,300 per night, all-inclusive. —Amy Gunia