Take off your sandals, and soak your toes in that crisp clear water, but only a little past your ankles or the moment will have spoiled by the crackle of the beach nazis on atvs, "No SWIMMING! GET OUT OF THE WATER".
https://www.chicagoparkdistrict.com/parks-facilities/beaches
Swimming in the Great Lakes is very dangerous, especially if you are not familiar with the behavior of the lakes.