FABB SPORTS registering teams for men's league. 301-203-5999.
WATERFRONT FESTIVAL -- Saturday starting at 8 a.m. Sailboat races, sailing flea market, park ranger presentation. Washington Sailing Marina, Alexandria. 703-684-5266.
ANNAPOLIS SAILING SCHOOL and Powerboat School offers beginning and advanced courses, and Kidship sailing courses for ages 5 to 15. 800-638-9192.
CHESAPEAKE SAILING SCHOOL has courses in Annapolis. 800-966-0032.
J WORLD has courses in Annapolis. 800-966-2038.
MARINER SAILING SCHOOL offers courses in Alexandria. 703-768-0018.
WOMANSHIP offers courses in Annapolis. 800-342-9295
U.S. COAST GUARD AUXILIARIES and U.S. Power Squadrons offer power and sail courses. 800-336-2628; in Virginia, 800-245-2628.
ALL AMERICAN CLUB -- Damascus. 301-253-5800.
ATLANTIC CYCLING -- 301-610-0526.
BIKE & BRUNCH -- 301-881-2453.
BIKE THE SITES -- 202-842-2453.
FREDERICKSBURG CYCLISTS -- 540-373-1451.
MID-ATLANTIC OFF-ROAD Enthusiasts -- 703-502-0359.
NATIONAL CAPITOL VELO CLUB -- 301-562-0419.
OXON HILL CLUB -- 301-567-6760.
POTOMAC PEDALERS -- 202-363-8687.
RESTON CLUB -- 703-904-0900.
SENIOR CYCLING -- 540-668-6307.
TEAM DC -- 202-882-1337.
WASHINGTON AREA BICYCLIST Association -- 202-628-2500.
WASHINGTON WOMEN OUTDOORS -- 301-864-3070.
WHOLE WHEEL VELO CLUB -- 703-426-5255.
FABB SPORTS registering for coed flag league. 301-203-5999.
ADVENTURING -- Saturday, to Great North Mountain; 202-249-9238. Sunday, to Rock Creek Park; 202-667-3314.
APPALACHIAN MOUNTAIN CLUB -- Tape: 202-298-1488.
CAPITAL CLUB -- Saturday, to Gathlnd State Park ($23); 703-241-7430 or 301-530-8633. Bus for most trips leaves 16th and I NW at 8 a.m. with suburban stops.
CENTER CLUB -- Saturday, to George Washington Forest; 703-517-3490. Saturday, to Lake Frank and Lake Needwood; 301-468-1896. Sunday, to Rocky Mountain and Brown Mountain; 703-765-0833.
MOUNTAIN CLUB OF MARYLAND -- Wednesday, to Oregon Ridge Park; 410-542-0533. Wednesday, to Lake Williams; 410-956-2010.
NORTHERN VIRGINIA CLUB -- Saturday, to Cacapon State Park. Saturday, to Blackburn Trail Center. Sunday, to Buck Ridge and Buck Hollow. Activities tape: 703-440-1805.
POTOMAC APPALACHIAN TRAIL CLUB -- Tape: 703-242-0965.
SIERRA CLUB -- Activities tape: 202-547-2326.
WANDERBIRDS -- Sunday, to White Oak Canyon, with swimming ($18); 301-251-0899. Bus for most trips leaves 17th and K at 8 a.m. with suburban stops.
ARABIAN HORSE FESTIVAL -- Saturday 9 to 6, by the Virginia Arabian Horse Association to benefit the Make-A-Wish Foundation, the Equine Rescue League and the Ranch Program at Salem. $5 per car. At Frying Pan Park, Herndon. 703-754-8814.
ARROWHEAD EQUESTRIAN Center has lessons for children and adults near Manassas. 703- 594-3512.
BROAD RUN RIDING SCHOOL in Midland has lessons for children and adults. 540-439-9586.
BUCK VALLEY RANCH -- Trail rides near Cumberland. 717-294-3759.
CLAY HILL STABLES has classes in Landover. 301-773-0444.
ELK MOUNTAIN TRAILS has guided rides near Harpers Ferry. 301-986-8483 or 301-834-8882.
EQUILIBRIUM HORSE CENTER has instruction in Gambrills, Md. 410-721-0885.
EQUESTRIAN ENTERPRISES has weekday trail rides and Saturday instruction in Great Falls, Va. 703-759-2474.
FORT VALLEY STABLES has trail rides in Massanutten Mountains. 888-754-5771 or 540-933-6633.
FOXCHASE FARM has riding lessons and introduction to fox hunting in Middleburg. 540-687-5255.
HARMON'S HAYRIDES -- Horse-drawn wagon rides near Brandy Station. 540-825-6707.
HIGHLANDER HORSES has trail rides in Shenandoah Valley. 540-636-4523.
HUNTER EQUESTRIAN CENTER offers riding lessons in Clinton. 301-292-9006.
HYAN FORGE RIDING SCHOOL has classes and camps for ages 5 and up in Crownsville. 410-923-8808.
LOFTMAR STABLES has hunter seat lessons in Bowie. 301-249-7893.
MARRIOTT RANCH -- Trail rides in the Blue Ridge Mountains. 540-364-2627.
MEADOWBROOK STABLES has lessons for children and adults in Chevy Chase. 301-589-9026.
MERRYMOUNT EQUESTRIAN CENTER -- Classes for children and adults in Upper Marlboro. 301-868-2109.
MOUNTAIN SPRING STABLE has trail rides in Blue Ridge Mountains. 703-987-9545.
MOUNTAINTOP RANCH has trail rides in the Shenandoah Valley and Blue Ridge Mountains. 540-298-9542.
PISCATAWAY STABLE has trail rides and hay rides in Clinton. 301-297-9808.
POTOMAC GLEN RIDING School has lessons for children and adults near Germantown. 301-601-0622.
POTOMAC HORSE CENTER offers lessons in Gaithersburg. 301-208-0200.
RIVER BOTTOM TRAIL RIDERS has trail rides in Patuxent River State Forest. 301-253-0999.
ROCK CREEK PARK HORSE CENTER has classes and rides in Northwest Washington. 202-362-0117.
ROCKING S RANCH has trail rides and lessons in Winchester. 540-678-8501.
RODES FARM has trail rides, lessons and pony rides in Blue Ridge Mountains. 804-325-8260.
TAMARACK STABLES has lessons and trail rides in Goldvein, Va. 703-752-7367.
TARTAN FARMS has lessons in Poolesville. 301-972-8567.
WATER'S GIFT EQUESTRIAN Center has English riding lessons in Burtonsville. 301-421-0380.
WHEATON PARK STABLES offers classes for children and adults, and Sunday trail rides. 301-622-2424.
WOODLAWN STABLES has lessons in Alexandria. 703-780-4344.
U.S. CAPITOL CLASSICS Tournament -- Friday and Saturday, competitions in 300 divisions; "supershow," Saturday at 7:30. Admission $20 to $50, under 5 free. Crystal Gateway Marriott, 1700 Jefferson Davis Hwy., Arlington. 703-920-3230.
MOTORCYCLE SAFETY FOUNDATION offers beginner and advanced rider courses. 800-833-3995 or 800-446-9227.
TWILIGHT POLO -- Saturdays at 7 through August at Great Meadow, The Plains. 540-253-5001.
LOCUST SHADE PARK 5K -- Saturday at 7:30 in Triangle. 703-221-8579.
SUMMER STRIDES 5K -- Sunday at 8 at Belle Haven Park, Alexandria. 703-486-1466.
LOUDOUN COUNTY 10K/20K -- Sunday at 8:15 in Leesburg. 301-871-0400.
MCRRC COMUS RUN 5 K -- Sunday at 5 p.m. in Comus. 301-353-0200.
DCRRC BETHESDA 5K -- Sunday at 6 p.m. at Lynwood Recreation Center, Bethesda. 703-241-0395.
DCRRC TIDAL BASIN 3K -- Wednesday at noon at the Jefferson Memorial. 703-241-0395.
DCRRC PAUL THURSTON 4.5-MILE -- Thursday at 6:45 p.m. at Burke Lake Park. 703-241-0395.
GIRLS JUST WANNA HAVE FUN 5K -- Aug. 27 at 8 in College Park. 301-927-1924.
WASHINGTON AREA ROADSKATERS has training and group skates in Washington. 202-249-2228.
MONTGOMERY WOMEN'S 30+ team needs goalie. 301-217-0028.
MONTGOMERY WOMEN'S 30+ team needs experienced players. 301-871-2702.
ALEXANDRIA/SPRINGFIELD adult leagues need players and teams. 703-851-3332.
NORTHERN VIRGINIA SENIOR league needs men 50+ and women 40+ for Tuesday and Thursday morning play. 703-913-0028 or 703-524-556.
ARLINGTON COED team needs male and female players for Saturday games. 703-499-3816.
INNER QUEST offers frequent classes in kayaking, canoeing, rock climbing and caving. 703-478-1078.
VENTURE EXERCISE for blind and disabled athletes, Saturdays at D.C. YMCA. 301-248-2681.
WASHINGTON WOMEN OUTDOORS offers cycling, hiking, rock climbing, canoeing and kayaking trips and instruction. 301-864-3070.