The Shamrock Shuffle is such a fun race that everyone should experience at least once. There is a lot of enthusiasm, Chicago loves St. Patrick's Day, and everyone goes all out, wearing their best green attire. This race follows part of the same route as the Chicago Marathon, so you get a small taste of what that race will be like too. Parking isn't great but if you take transit, it's a breeze.
The after party is a blast and overall, it's one of the best spring races in the area.