I’m laying claim officially here on the internet that on July 28th, 2012 Colin Loftin, Nick Lloyd and Aryn Crowley were the first to successfully swim in all of the Chicago lakefront beaches as listed on the Chicago Beaches Wikipedia Page here in one day.
Criteria to complete this feat: All members of your beach conquer party must completely submerge themselves in the water at said beach, and visit all beaches listed above in a sun up to sun down period.
Video Proof: