Skate under the Chicago skyline and within eyeshot of the Chicago Christmas Tree at the McCormick Tribune Ice Rink in Millennium Park. Plus, take advantage of free skating lessons on most Saturdays and Sundays, where you can learn both beginner- and intermediate-level skills. Note that you'll need to make a free online reservation for both regular skating and lessons, and if it seems too warm to skate, call ahead—this rink is open through February 2, weather permitting.