Ryugujo Spa Hotel Mikazuki

This resort hotel is also known for hosting professional shogi title matches. The property has two buildings: the main Ryugutei building and the newer Fujimitei building. Every room offers an ocean view, while all rooms in Fujimitei feature a terrace and semi-open-air bath.

Overnight guests receive a wide range of benefits. The Spa Building, a hot spring theme park, offers sweeping views of Tokyo Bay and a variety of baths filled with water from Kisarazu Mikazuki Onsen, a natural hot spring that rises from 800 meters (about 2,625 feet) underground. Be sure to check out the unusual baths found only here, including the Tanuki Bath, inspired by one of Japan's three great tanuki legends from Kisarazu, and the Golden Bath, made from ¥150 million worth of pure gold.

The year-round pool area includes Oceans Spa, an outdoor heated pool, and Aqua Park, an indoor pool that can be used regardless of the weather or season. In summer, the 250-meter (about 820-foot) Garden Pool lazy river also opens. Put on your swimsuit and spend the entire day enjoying the water.

Other amenities and services include an all-you-can-eat buffet featuring 50 Japanese, Western, and Chinese dishes, a pet hotel, and an animal café where friendly animals welcome guests.