Whether you're into running, biking, swimming or kayaking, there's something here to keep you active.

Relay for Life: The American Cancer Society seeks volunteers and teams for the 24-hour event, in which teams of 10 to 15 participants take turns walking or running around a track to raise funds for the nonprofit group. Music, games, entertainment provided during each relay. There are multiple dates and locations. For details, call 1-800-ACS-5445 or go to www.cancer.org.

Greenfield Glide 5K Run & Fitness Walk: Cross-country challenges are presented in this 24th annual race through Schenley Park. Schenley Park Overlook (June 1). To register, call Citiparks at 412-422-8885.

Riverview Park 5K run and fitness walk: Riverview Park Activities Building, 7 p.m. (June 6). 412-255-2493 or www.riverview5K.com.

Panther Hollow Challenge, 10K, 5K: Westinghouse Monument, Schenley Park, 9 a.m. (June 22). 412-327-2151 or www.thegreater pittsburghroadrunnersclub.com.

Pittsburgh Pirates Fun Run/Walk for Epilepsy: PNC Park, 9:30 a.m. (June 21). 1-800-361-5885 or www.efwp.org.

Brookline Breeze 5K Run/Walk: 5K run and fitness walk and 1-mile fun run. Brookline Boulevard at Pioneer Avenue (Aug. 9). 412-531-9227 or www.brooklinebreeze.com.

Run Around the Square: 1.5-mile fun run/walk through Fern Hollow in Frick Park includes costumed characters and musicians. Regent Square School (Aug. 23). 412-422-6562.

Gatorade/Steelers 5K Race, Fitness Walk and Kids' Kickoff Run: Heinz Field, 9 a.m. (Sept. 1). 412-697-7713 or e-mail 5K@steelers.com.

Dollar Bank Junior Great Race: Ninth annual race includes the One-Mile Family Fun Run, the 50-Yard Tot Trot and the Diaper Dash. Downtown (Sept. 21). 412-255-2493.

Richard S. Caliguiri Great Race: 10K race begins in Frick Park at Beechwood Boulevard and finishes outside Point State Park. The 5K will start at Fifth and Atwood in Oakland and follow the same route as the 10K to the finish line (Sept. 28). 412-255-2493.

Great Strides Walk: 10K walk and day of fun and fitness with games and pony rides benefits the Cystic Fibrosis Foundation. North Park, Boyce Park and South Park (May 18). www.cff.org/great_strides.

Walk With Me Easter Seals Benefit: Pittsburgh Zoo & PPG Aquarium (July 19). 412-281-7244, ext. 229 or 221, or www.walkwithme.org.

Pedal Pittsburgh: A 6- to 60-mile bike tour of Pittsburgh design landmarks and neighborhoods. Begins at Station Square (May 18). 412-232-3545.

Escape to the Lake: 150-mile bike tour from Cranberry to Lake Erie to raise money for the National Multiple Sclerosis Society (June 7-8). www.nationalmssociety.org or 412-261-6347.

Tour de Cure: Rides of 8 to 100 miles. Benefits American Diabetes Association. Seneca Valley High School, Harmony (June 22). 1-888-342-2383.

For more information on biking events, go to the Western Pennsylvania Wheelmen site at www.wpwbikeclub.org or call 412-422-2234.

Citiparks will operate 18 outdoor swimming pools from June 13 through Labor Day. Pools include Ammon (Hill District), Banksville, Bloomfield, Fowler (Perry South), Highland Park, Homewood, Jack Stack (Brighton Heights), Magee (Greenfield), McBride (Lincoln Place), Moore (Brookline), Ormsby (South Side), Phillips (Carrick), Ream (Mount Washington), Riverview Park, Schenley Park, Sue Murray (North Side), West Penn (Polish Hill) and Westwood.

Individuals can purchase pool tags or pay a daily admission fee. Pool tags for city residents are $30 (16 and over); $15 (ages 3-15); $60 per family of four; $10 each individual member; $45 noncity resident. Daily admission is $4 adults; $3 kids.

Each pool will sponsor a Citiparks swim team for children 6-18 years old. Teams will compete throughout the summer and the ultimate champions will compete at the Citiparks Championship Swim Meet Aug. 2 at the Highland Park pool.

Throughout the summer, children from preschoolers to teens can attend swimming lessons for a small fee. Citiparks will offer free two-week "learn to swim camps" at various pools throughout the summer for children 6-15 years old.

Pool information: 412-323-7928.

Citiparks has multiple courts in Frick, Highland, McKinley, Mellon, Schenley and West parks, as well as courts in dozens of neighborhood parks and playgrounds.

Summer programs include tennis lessons and summer tennis camps. Various fees.

Bob O'Connor Summer Tennis Classic: Tennis enthusiasts of all ages and abilities will take to five city courts for the second annual competition (June 21-29). Following its inaugural year, the Tennis Classic received the 2008 USTA President's Award for becoming the largest adult tournament to be held in the City of Pittsburgh in decades.

Paul G. Sullivan Championship: Now in its 88th year, this tournament is open to all players 16 and older. Frick Park Red Clay Courts (July 12-20).

Tennis information: 412-244-4188.

Eat'n Park/Hope Classic: 3-on-3 double elimination tournament and skills contests for ages 8 and up, with proceeds benefiting the Hope Network. Galleria at Pittsburgh Mills (June 14). 412-826-2771 or www.hopenetwork-pa.org.

Disc golf: 18-hole course at Schenley Park Meadow; nine-hole course at Phillips Park in Carrick. For more information, call the Flying Disc Society at 724-933-6969.

Lawn bowling: The Frick Park Lawn Bowling Club offers free introductory lessons at 1 p.m. Saturdays through May and by appointment at the greens in Frick Park, 7300 Reynolds Ave. www.lawnbowling.net or 412-782-0848.

Take a hike on one of these outstanding trails.

Armstrong Trail: 724-543-4478. This 52.5-mile trail winds along the Allegheny River from Armstrong County to Clarion County.

Arrowhead Trail: 724-942-5000, www.peterstownship.com. Four miles of winding trail along Brush Run Creek in Peters.

Butler-Freeport Community Trail: www.dcnr.state.pa.us. More than 10 miles of crushed limestone surface.

Eliza Furnace Trail: 412-255-2539. Nearly three miles of trail running from Downtown to Greenfield between Second Avenue and the Parkway East.

Montour Trail: 412-831-2030, www.montourtrail.org. More than 30 miles of trail from Carnegie to Weirton, W.Va.

Three Rivers Heritage Trail: 412-488-0212 or www.atatrail.org. Five miles of trail beginning at Washington's Landing and running along the picturesque Allegheny River to the North Shore.

Yough Trail North: 724-872-5586 or www.youghrivertrail.com. From McKeesport to Connellsville, the trail encompasses 43 miles along the Youghiogheny River.

The region's premier outdoor recreation nonprofit organization offers more than 500 outings, classes and events (year-round) designed to make it easy to try new activities outdoors, especially for beginners. They offer private programming for groups, and their public programming is open to all. For a complete list of activities: www.ventureoutdoors.org. To register, call 412-255-0564.

Here are some highlights for this season:

Venture Outdoors Festival: Join Venture Outdoors for an entire day of FREE outdoor activities for all ages and skill levels. Try your hand at biking, kayaking, fishing, climbing, dragon boating, and yoga (May 17, 11 a.m.-6 p.m.). Washington's Landing. Free parking and shuttle to the festival in the Del Monte lots along River Avenue.

Paddling: From May to October, kayak and hydro bike rentals at Kayak Pittsburgh Downtown, 412-969-9090, located under the Roberto Clemente Bridge, and kayak, canoe, and rowboat rentals at the Kayak Pittsburgh North Park Boathouse, 724-935-1968.

Beginner Paddles Downtown every other Monday. $25 for members, $40 for nonmembers. 5:45-8:30 p.m.

Beginner Paddles at North Park Lake every other Monday starting May 14. $20 for members, $35 for non-members. 6-8 p.m.

Wednesday Wake-up Paddles every Wednesday. $10 for members, $20 for nonmembers. 6:15-7:30 a.m.

Happy Hour Paddles 5:45-7 p.m. June 13, July 10, Aug. 1, Aug. 22. 5:45-7 p.m.

Fireworks Paddles on May 23, June 20 and July 11. $30 for members, $50 for nonmembers. 8-11 p.m.

TriAnglers Downtown Fishing Program every Wednesday in front of PNC Park on the Riverfront Trail 11:30 a.m.-1:30 p.m. All gear and bait provided (all participants age 16 or older must have valid Pennsylvania fishing license). $5 season pass.

Day Treks (Lite), Pie Hikes, Beer and Wine Hikes, Nature Hikes, Yoga Outdoors, Tyke Hikes (Family Programs) and Doggie Day Treks, to name a few. More than 60 different hikes in state, county and city parks. Prices vary from $3-$40 depending on activity.

Green Building Bike Excursions, May 31, June 21, July 26. $15 for members and $30 for nonmembers. 1-6 p.m.

Urban Bike Rides (on a brand new fleet of bikes) along the Riverfront Trail Downtown Trail July 6, August 9. $10 for members and $20 for nonembers. 1-4 p.m.