SEAMANSHIP AND SAFETY courses with Coast Guard Auxiliary 75 start Tuesday at Naval Research Laboratory. 301-262-5609 or 301-773-9383.
U.S. COAST GUARD AUXILIARIES and U.S. Power Squadrons offer power and sail courses. 800-336-2628; in Virginia, 800-245-2628.
MEN'S AND COED leagues need players and teams. 703-851-3332.
CAPITAL CLUB -- Saturday, to Tuscarora Trail ($18); 703-812-4855 or 703-401-2719. Bus for most trips leaves 16th and I NW at 8 a.m. with suburban stops.
CENTER CLUB -- Saturday, Skyland to Panorama; 703-517-3490. Saturday, to Catoctin Mountains; 301-898-5363. Saturday, in Washington parks; 703-525-3357. Sunday, to South River Falls; 301-946-2520. Sunday, to Carderock; 703-467-9701 or 301-773-7527.
MOUNTAIN CLUB OF MARYLAND -- Saturday, to Soldiers Delight Park; 410-922-0382. Wednesday, to Old Rag; 410-796-2722.
NORTHERN VIRGINIA CLUB -- Saturday, to Bluff, Marshall and Appalachian trails. Sunday, to Browns Gap. Sunday, in Reston for dogs and owners. Activities tape: 703-440-1805.
POTOMAC APPALACHIAN TRAIL CLUB -- Tape: 703-242-0965.
SIERRA CLUB -- Saturday, to Big Schloss. Activities tape: 202-547-2326.
WANDERBIRDS -- Sunday, to Buzzard Peaks ($18); 202-38-3725 or 202-669-0351. Bus for most trips leaves 17th and K at 8 a.m. with suburban stops.
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.
GREENWAY STABLES offers unguided trail rides near Dulles Airport. 703-327-6117.
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.
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.
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.
WASHINGTON WOLVES women's team needs players. 800-514-1240.
MOTORCYCLE SAFETY FOUNDATION offers beginner and advanced rider courses. 800-833-3995 or 800-446-9227.
EBENEZER A.M.E. CHURCH 5K -- Saturday at 8 in Watkins Park, Upper Marlboro. 301-749-8290.
DCRRC PREDICTED TIME 5-MILE -- Saturday at 9 at Fletcher's Boathouse. 703-241-0395.
MENTAL HEALTH RUN 5K/2MILE -- Saturday at 9 in Rock Creek Park. 703-218-2726 or 703-920-5193.
TRURO PRESCHOOL 5K -- Saturday at 9 in Fairfax. 703-691-1006.
HEART WALK -- Saturday at 10 at Freedom Plaza, for American Heart Association. 703-914-3712.
BROWNE ACADEMY 3K -- Saturday at 10:30 in Alexandria. 703-960-3000.
VOLKSMARCH 5K/10K/12K WALKS -- Saturday in Gaithersburg with Seneca Valley Sugarloafers; start 8 to noon at Watkins Mill High. 301-340-9418 or 301-530-8173.
DCRRC REDISCOVERY 10K -- Sunday at 8 in West Potomac Park. 301-299-2170.
ROCKVILLE 10K/5K -- Sunday at 8:30 at King Farm, Rockville. 301-460-8888 or 301-353-0200.
END COLON CANCER 5K -- Sunday at 2 at Seventh and Pennsylvania NW, for the Colorectal Cancer Network. 301-879-1500.
DCRRC TIDAL BASIN 3K -- Wednesday at noon at Jefferson Memorial. 703-241-0395.
SELF-TRANSCENDENCE 2-MILE -- Oct. 23 at 8 in Rock Creek Park. 202-363-4797.
MAKE A DIFFERENCE 5K -- Oct. 23 at 8 at Tucker Road Community Center, Fort Washington. 301-203-6000.
CRIME VICTIMS FUND 5K/1-MILE -- Oct. 23 at 9 at Watkins Park, Upper Marlboro. 301-952-3801.
MCRRC CANDY CANE 8K -- Oct. 23 at 9 in Chevy Chase. 301-353-0200.
JOHN SARVEY 5K -- Oct. 23 at 11 in Silver Spring. 301-384-6672.
POUND/PEDAL PANT DUATHLON -- Oct. 24 at 7:30 in Hartwood, Va.; 3-mile run, 17-mile bike, 3-mile run. 540-775-4952.
TRICK OR TROT 5K -- Oct. 24 at 8:30 at Arlington YMCA. 703-525-5420.
GOBLIN GALLOP 5K -- Oct. 31 at 9 at Fair Lakes Shopping Center; 1K at 8:30. A benefit for the John Quadrino Foundation for Children With Cancer. 703-536-2027.
MONTGOMERY MEN'S 55+ team needs players. 301-530-8790.
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.