EARLY START: The Anacostia Watershed Society is sponsoring a 120-mile sea kayak trip for nine paddlers from Washington to the mouth of the Potomac River. Participants depart with the tide at 8 a.m. Monday and aim to wind up six days later at Point Lookout. To see them off, stop by Bladensburg Waterfront Park about 7:15 on Monday. For information, check the Web site at www.anacostiaws.org or call 301-699-6204.

FIXER-UPPER: The Raptor Society hears a talk on rehabilitating injured birds of prey at 8 p.m. Monday in Green Spring Gardens Park, 4601 Green Spring Rd., Alexandria. Call 703-642-5174.

LIKE FATHER: Jeff Murray, son of the Shenandoah Valley's famed flyfishing wizard Harry Murray, offers tips on smallmouth bass fishing at the monthly meeting of Northern Virginia Chapter of Trout Unlimited at 7:30 p.m. Thursday in Fairfax County Government Center at 12000 Government Center Parkway, Fairfax.

LONG WALK: Sierra Club has a loop hike scheduled Saturday from Chain Bridge to Key Bridge via the Heritage Trail on the Virginia banks of the Potomac, then back via C&O Canal, a total of about nine miles. Leader is Larry Broadwell, 301-215-7135.

Potomac Appalachian Trail Club plans an easy four-mile midweek hike at Mason Neck National Wildlife refuge on Wednesday. Hikers meet at 10 a.m. in the Woodmarsh Trail parking lot. A $4 picnic lunch is available at the end. Call Irene Kamm, 703-780-8568.

TOTS AFLOAT: Canoe Cruisers Association member Gus Anderson talks about canoeing, sea kayaking, ski touring and canoe camping with small kids at CCA's monthly meeting at 7:30 p.m. Wednesday in Clara Barton Center, 75th and MacArthur Blvd., Cabin John.

DEMO DAYS: If you always wanted to try a personal watercraft, the generic name for what used to be called Jetskis, free demonstration rides are being offered from 9 a.m. to 5 p.m. today at Sandy Point State Park at the western end of Chesapeake Bay Bridge. It's part of a national safe boating campaign promotion by Sea Doo, a company that makes the infernal combustion toys.