Click on this link to see lists of things to do in Concord and Museums to visit:   http://www.tripadvisor.com/Attraction...

Here's a sample or two: 

Orchard House , Concord
House where Louisa May Alcott wrote "Little Women."
Attraction type: Historic home; History museum; Historic site

Concord Museum , Concord
A fascinating collection of Thoreau memorabilia.
Attraction type: History museum; Museum