The blog, Chicago Quirk, highlights some of the best rinks in the city, including Millennium park (which is not in the Sloop but close enough for us to enjoy):
McCormick Tribune Ice Rink, AKA Millennium Park Ice Skating Rink
As I said last week, I think all Chicagoans should try this at least once. It's a beautiful rink in a beautiful setting. I've been a few times, and it's a lot of fun. Although don't go during a high touristy time unless you want to get bowled over by families of five. Admission is free and skate rental is $10.
Agreed, it's a truly beautiful place for a skate.
(Image from Chicago Quirk)