Boston Marathon is a great experience for all who run. :) I was there in 2013 and on Boylston St. when the bombs went off, so I went back in 2014 to finish. It was a very emotional day for me, and most likely my last time running Boston, as it will never be the same. But, I was impressed with Boston Marathon, police, spectators and everyone involved as the city really came together stronger than before. Its one of the best experiences you could have as a runner. The expo and parking for pick up is Crazy busy, and I wish there was something they could do, maybe even add a few extra days or different location.