Umihotaru Parking Area (Tokyo Bay Aqua-Line)

Built to resemble a luxury cruise ship floating in Tokyo Bay, Umihotaru's five-story building consists of parking lots on the first to third floors, and commercial facilities such as restaurants and souvenir shops on the fourth and fifth floors. The free rest area on the fourth floor is glass-sided with an incredible view of the ocean, where you can gaze at the crossing ships, airplanes and a beautiful sunset. At the shops, look for a variety of Boso area specialties, famous confections, and accessories only available here, including locally grown peanuts, the famous mackerel burger, clam buns, and Umihotaru pudding baum cake. There is also a free foot bath for soaking and relaxing while enjoying the ocean view.

Join the Tokyo Bay Aqua-Line Behind-the-Scenes Adventure tour and explore the rare backsides of the Aqua-Line. The guide takes you on foot from the undersea tunnel entrance to the emergency evacuation passage while giving intriguing explanations. You can also see the actual cutter face that was used to excavate the undersea tunnel and a video documenting the construction. Duration is around 1.5 hours and requires online reservations.