BELTSVILLE CLUB plays Sundays. 301-937-6613.
D.C. CLUB plays Thursdays at St. Alban's School, Washington. 202-776-7707.
BOATING SAFETY course with Coast Guard Auxiliary 14-6 starts July 25 at Hayfield High, Alexandria. 703-780-8914.
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.
ALL-STAR CAMPS for ages 8 to 15 with Coach Bill McGregor start Monday in Kensington and July 25 in Riverdale. 301-596-3921 or 301-864-2755.
ADVENTURING -- Saturday, to Pond Run-Half Moon Lookout; 202-249-9238.
APPALACHIAN MOUNTAIN CLUB -- Tape: 202-298-1488.
CAPITAL CLUB -- Saturday, to Gettysburg Battlefield ($23); 301-384-2809 or 202-484-3921. Bus for most trips leaves 16th and I NW at 8 a.m. with suburban stops.
CENTER CLUB -- Saturday, Skyland to Big Meadows; 703-517-3490. Saturday, to Great Falls, Md.; 301-468-1896. Sunday, to Calvert Cliffs; 703-527-2349.
MOUNTAIN CLUB OF MARYLAND -- Sunday, to Jeremy's Run/Knob Mountain; 301-946-2792.
NORTHERN VIRGINIA CLUB -- Saturday, to Big Meadows. Saturday, to Trout Pond Recreation Area. Activities tape: 703-440-1805.
POTOMAC APPALACHIAN TRAIL CLUB -- Tape: 703-242-0965.
SIERRA CLUB -- Saturday, to Kenilworth Aquatic Gardens. Saturday, to Big Schloss. Sunday, t Shenandoah River State Park. Activities tape: 202-547-2326.
WANDERBIRDS -- Sunday, to Buck Ridge, Hazel Mountain, Hot Short Mountain and Nicholson Hollow Train ($18); 703-451-4040 or 410-535-5171. 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.
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.
GIRLS CAMP by Academy International starts Monday at Great Meadow, The Plains. 888-529-3827.
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 Meadown, The Plains. 540-253-5001.
MCRRC ROCKVILLE ROTARY 8K -- Saturday at 8:45 p.m. in Rockville. 301-353-0200.
DCRRC TIDAL BASIN 3K -- Wednesday at noon at Jefferson Memorial. 703-241-0395.
MCRRC RILEY'S RUMBLE -- July 24 at 7 at Riley's Lock, Potomac. 301-353-0200.
DCRRC 1-MILE/3-K -- July 27 at 6:30 p.m. at Washington-Lee High School, Arlington. 703-241-0395.
MCRRC TAKE BACK THE NIGHT 5K -- Aug. 2 at 7 p.m. in Olney.
MCRRC GO FOR THE GLORY TRACK Meet -- Aug. 8 at 7:15 p.m. at Walt Whitman High, Bethesda.
WASHINGTON AREA ROADSKATERS has training and group skates in Washington. 202-249-2228.