The BAA 5k is probably the most crowded race I've ever run, but it was super fun! The course is a beautiful spin around downtown Boston and crosses the Boston Marathon finish line. Highly recommend if you're around that weekend--just get really far up in the corrals if you want to race vs. just run for fun. My one big gripe is that the shirts are unisex, so if you're a smaller lady they're huge. More on my blog! https://shorterandfaster.com/2017/04/18/sugarloaf-training-week-11-boston-marathon-weekend/.