The Boston Marathon is the world’s oldest and most prestigious annual marathon and part of the World Marathon Majors. A maximum field size of 25,000 participants begin in the rural town of Hopkinton and run the legendary course through eight cities and towns before finishing in Boston’s Back Bay. The 2010 edition will mark John Hancock Financial's 25th year as principal sponsor.

Starts and ends at San Dieguito County Park. Scenic course through Rancho Santa Fe. "This is one of the most beautiful and scenic courses you will ever run."