Even if you only have a few days in Tokyo, I recommend taking the boat to Odaiba. The boat itself looks like a futuristic James Bond space vessel. Catch the boat from Asakusa (the area famous for Senso-ji, Tokyo's large Buddhist temple) and take the 50-minute cruise along the Sumida River and into Tokyo Bay. Odaiba is a man-made island situated in Tokyo Bay, with views of Rainbow Bridge, the miniature Statue of Liberty, and the geometric Fuji TV building. There's lots of shopping on the island and a few museums, but the real reason to visit Odaiba is the view of Tokyo across the bay.