31st Street Beach Wile away an hour cloud-gazing at the surprisingly quiet beach. (312) 742-5121; chicagoparkdistrict.com
Bike and Roll Chicago Remember to ask for a lock so you can stop and explore by foot. (312) 729-1000; bikeandroll.com
John Hancock Observatory Get a bird's-eye view of Chicago. Admission charged. (888) 875-8439; jhochicago.com
Lincoln Park Zoo One minute you're walking through a park; the next, you're in a world-class zoo (left). Free. (312) 742-2000; lpzoo.org
McCormick Bridgehouse and Chicago River Museum On select days, visitors can reserve a spot inside when the bridge lifts. Admission charged; open seasonally. (312) 977-0227; bridgehousemuseum.org
Millennium Park This now-iconic sculpture park offers free concerts and downloadable tours. (312) 742-1168; millenniumpark.org
Navy Pier This hub of lakefront activity includes a 90-foot Ferris wheel, restaurants, boat cruises and the free Smith Museum of Stained Glass. (800) 595-7437; navypier.com
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