* CYCLING THROUGH: Greg LeMond's two Tour de France wins in the 1980s and a third in 1990 were great, but Lance Armstrong's five straight victories in the race, and the compelling story of his recovery from cancer to get there, have gone a long way in pulling road bike racing in from the U.S.'s athletic fringe. Around here it seems there are would-be racers furiously leg-pumping their thin-wheeled bikes on nearly every main road -- including the George Washington Parkway and the Whitehurst Freeway in the District. I'm not so sure I'd want to be on a bike on those roads with cars roaring past. Anyway, on May 30 some of the finest bikers around, including Sydney Games gold medalist Marty Nothstein, will be in Arlington for the seventh annual CSC Invitational, the race formerly known as the Clarendon Cup. The event, sanctioned by the United States Cycling Federation, is held on a one-kilometer course (no cars allowed) at the Clarendon Metro station and starts at 8 a.m. The men's pro invitational, which is 100 kilometers long and has $10,000 in prize money, starts at noon. For details and directions, visit www.arlingtonsports.org.

* SPLISH, SPLASH: For versatile boaters, those who can go from creek boats to slalom boats to playboats without missing a beat, the Potomac River essentially is several rivers rolled into one. Dropping through Great Falls, wave-playing at O-Deck or S-turn, attaining up and sprinting down through Mather Gorge -- the Potomac Whitewater Festival puts all of this under one tent next weekend. There are several events, but a highlight -- if the water level is low enough -- will be the Great Falls race, on Class V-VI whitewater starting at 5 p.m. on Saturday. For more information, visit www.potomacfest.com.

* ON LINE: The Northern Virginia Chapter of Trout Unlimited will next meet on June 3 at the Vienna Volunteer Fire Department, 400 Center St. Featured speaker Gil Willis will talk about trout fishing in West Virginia. There is a fly-tying clinic at 6:45 p.m. Willis's talk starts at 7:30 p.m. Non-members are welcome. For details, visit www.nvatu.org.

-- John Mullen

mullenj@washpost.com