Odaiba is an interesting collection of malls, museums, and businesses on an island in Tokyo Bay.  There’s enough here to easily spend a day.

The architecture of the buildings itself is interesting – the buildings are very futuristic.  Even the public art is interesting.  The island is fairly large – walking around to see everything will take some doing.  So, there’s a dedicated automated train – the Yurikamome – that takes people around the island, and connects with public transit back on the mainland.

Sites we personally visited:

Fuji TV building

They have a free tour of the building.  You don’t get to see much, but the building itself is pretty cool.  There is a funky observatory (inside a sphere) that does require a ticket, that we didn’t check out.

Decks Tokyo Beach and Aquacity

These are 2 separate malls right next to each other.  Decks has a 3-story arcade, Tokyo Joyopolis, with a variety of sophisticated games and rides.

National Museum of Emerging Science

Very cool museum with exhibits on biology, computers and networking, and space.