I train in the back bay and have done the OC half for the past two years. They changed the course last year from the year prior. In 2009, the course went along the back bay, which was pretty but it was very quiet with few to no spectators and it was crowded for the space. Last year, they opened up the course to be through the neighborhood. Course is so much faster with the open space. I ran a PR on this course for the half marathon, and will be racing it again this year. (I’m hoping to submit enough reviews here to win the registration!).