Learn to climb on the world’s tallest indoor climbing wall at Athletic Club Illinois Center in Chicago. Private or group instruction available. Call Will Menaker, 312-348-0581.
HIKING
The Forest Trails Hiking Club takes off on a 9-miler at 9:30 a.m. Sunday through Herrick Lake-Danada Forest Preserve in Warrenville. Call Wally Moll, 708-739-5637.
The McHenry County Conservation District features a 1 p.m. Sunday hike along the Nippersink Trail at Glacial Park, with guided wildlife sightings. Call 815-678-4431.
A free seminar on cooking on back-country camping trips at 7 p.m. Thursday at REI Inc., Niles. Call 708-470-9090.
RACQUETBALL
The Lombard Glass Court Swim & Fitness Club hosts AARA Metro regional championships Friday through Sunday. Call 708-629-3390.
RUNNING
The Lake County Races seeks volunteers for its May 1 marathon, half-marathon and 10K. Call 708-266-RACE.
The Shamrock Shuffle is the place to be Sunday. More than 6,000 runners are expected for the 8K through downtown Chicago, beginning at 9 a.m. A series of clinics for runners will start at 9:30 a.m. Saturday at the Chicago Hilton and Towers. Call 312-666-9836.
Saturday’s only local race is the Walleye Run 5K at 9 a.m. in Spring Valley. Call Lori Guerrini, 815-664-2494.
Travel to Waukesha, Wis., Saturday and run the Trail Breaker marathon, half-marathon and 4-miler. Call Kim Hanes, 414-453-7600.
TENNIS
A novice tennis tournament for unranked juniors will be April 1-3 at the Heritage tennis club in Arlington Heights. Call Jason Stanislaw, 708-398-7780.
Also April 1-3: The score Easter Bowl for boys- and girls-10s. Call Jim Fannin, 708-482-4800. For adults, a men’s- and women’s-35s and 50s doubles, Mid-Town tennis club. Call John Trump, 312-235-2300. The Midwest Men’s Open is at Hyde Park Athletic Club, men’s singles and doubles. Call Mary Toole, 312-548-1300.
SOFTBALL
Spring leagues are forming: In Evanston, call 708-866-2910 for men’s 12- and 16-inch, women’s 14-inch and combined 14-inch. In Chicago, call the Lincoln Park Social Club, 312-525-2880, or Command Performance Social Club, 312-975-6435.
VOLLEYBALL
On Saturday, visit North Beach Chicago for indoor action: It’s the Midwest Pro Beach for women. Call 312-266-7842.
