There are many things to do in Boston and you may want to read a couple of Guide Books to get a flavor for some of the options. It is definitely a walking town so you may want to get T directions from you hotel. There has also been tunnel closure so please check alternate direction airport directions at
http://www.massport.com/about/press_news_twtcl2.html If you are a baseball fan you will want to check out Fenway Park and the Freedom Trail is a popular historic tourist attraction as well us the Duck Tours. Don't forget to bring comfortable walking shoes.