We stayed the night at the Marriott Long Wharf, which was walking distance from the TD Garden. However, it was in the single digits that night so it was a COLD walk.
Chris got up early the next morning (6am) and went to the gym and used the pool. I was up early but was no way motivated to get out of bed and exercise. I did get up at 7am and wandered around the hotel taking some photos. The pool does have a nice view of the warf.