Hundreds of runners and walkers hit the Chicago Lakefront Trail Sunday morning for a special May Day 5K Run & Walk. The 3.1-mile course started and ended at the McCormick Place Lakeside Center ...

Both courses begin and end in Grant Park, with the walk moving down the Lakefront Trail and the run heading past the Chicago River ... See the full course map below.

CHICAGO (WLS) -- Hundreds of walkers and runners hit Chicago's Lakefront Trail in honor of May Day on Sunday. Also known as International Workers' Day, the public holiday, observed on May 1 ...