Declan Murphy wrote:
 
> I need to come up with a few wet weather venues to take foreign students
> (all adults) to when in the Tokyo area. As Odaiba is increasingly on the
> itinerary, I was thinking perhaps to add the Maritime Museum
> http://www.funenokagakukan.or.jp
> to the list. Has anyone been there? Is it interesting etc?
> 
> And any other suggestions?

Battleship Mikasa in Yokosuka.  Fought in the war against Russia 1904-1905. 
Perhaps not for the rainy day.
http://www.midwaysailor.com/mikasa/

Shin-Yokohama Ramen Museum is a well-done miniature theme park.  The noodle
shops are set in a suburban community circa 1955.
http://www.raumen.co.jp/english/

Mandarake Bookstore, Nakano is not a museum but much more than a bookstore. 
They sell posters, T-rex skulls, old plastic models, etc.  Shibuya branch is
near Tokyu Hands.
http://www.geocities.com/evelynleeper/jp-hama.htm#nakano
http://www.geocities.com/evelynleeper/jp-tokyo.htm#shibuya