» The Start, Hopkinton, Mass. If you can get close to the starting line, the thousands of runners stretching and praying are a great sight.
» Mile 10, Natick Center. Runners are hitting their stride at this point, and there’s a lovely town common with a bakery nearby, in case watching all this exertion makes you hungry.
» Mile 13.1, The half-marathon point, Wellesley. Watch in the square and you can still hear the Wellesley College students cheering.
» Mile 20.5, Heartbreak Hill. This is where your encouragement will be most appreciated. Runners are losing steam here, and all the training in the world doesn’t help flatten this pace-ruining stretch of the route.
» Mile 25.2, Kenmore Square. You’ll actually find standing room here, around the corner from Fenway Park, as opposed to the finish line, where it’s too packed to see the runners. And since they have only a mile to go, you might actually see runners smiling.