My friend and I will be in Manhattan tomorrow and it is supposed to RAIN all day! We have matinee show tickets for afternoon, but obviously, doing a lot of outdoor stuff won't work! Any recommendations for good INDOOR things? We're taking the train over from NJ Penn Station.

You might try looking at this earlier thread...

http://preview.tinyurl.com/62p94v

Well there is always musuem mile on 5th Ave.:
104th St. El Museo del Barrio
103rd St. Museum of the City of New York
92nd St. The Jewish Museum
91st St. Cooper-Hewitt, National Design Museum, Smithsonian Institution
89th St. National Academy Museum and School of Fine Arts
88th St. Solomon R. Guggenheim Museum
86th St. Neue Galerie New York

83rd St. Goethe-Institut New York/German Cultural Center
82nd St. The Metropolitan Museum of Art

Not to mention, the Museum of Natural History

There are dozens of Museums from the world famous -

The Met - the greatest cultural institution in the western hemisphere

to the arcane

The Museum of Sex (if you're broad minded)

The main branch of th epublic library - near the theater district - usually has very good exhibits. MoMA is also right nearby.

And there's always shopping.

Do you have any special interest - so people can reco someting specific?

You're coming into NYC Penn station on 34 st. and the theaters are in the 40's-50's so all of the museums listed are pretty far uptown. MOMA
moma.org however is very conveniently located on west 53 st. The new Museum of Art & Design at Columbus Circle is another idea. http://madmuseum.org/Default.aspx

Get thee to a museumery!

If you like art, the Frick is a sweet museum and you could cover it in the a.m. if you get there at opening time.

If you love art, you might want to stay longer.

Thanks for the suggestions. We're thinking the Natural History would be a good one. We'll be heading out in a few minutes! Fortunately, we have Broadway tickets for a matinee in th afternoon.