The American Museum of Natural History is a great place to spend a day. The museum is located right across the street from central park at 79th street. The admission price was around $25 for two of us, and that was with the space exhibit. It is easy to get around, and the exhibits are interesting to look at. The place was very easy to manage with a stroller, which was important for us.
I'd highly recommend a daytrip to the history museum.
more