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Also:
Sierra Club
Sat: Big Meadows area of SNP (9 mi)
Sun: Sugarloaf Mountain (8 mi)
Potomac Appalachian Trail Club
Many cabin and trail crew work trips.
Tue: GWNF Trout Pond Recreation Area (17 mi)
Center Hiking Club
Sun: Overall Run, SNP, with swimming hole (8 mi)
Northern Virginia Hiking Club
Sat: Doyles River Trail (8.4 mi)
Sun: Burke Lake Park (5 mi)
Wanderbirds
Sun: Swimming hike to Buck Ridge, Hazel Mtn, Hot-Short Mtn, and Nicholson Hollow Trails, SNP (8.9-11.6 mi)
Washington Women Outdoors
Sun: Maryland Heights (5 mi)
Audubon Naturalist Society
Thurs: birding in Rock Creek Park
Maryland Native Plant Society
Tue eve: Summer Wildflower Identification Workshop
FOR KIDS
Rock Creek Park
Various planetarium programs.
Wed: Design an Animal (ages 5+), Drawing outdoors (ages 10+)
Thu: Nature journal (ages 9+), What's for Dinner - what do animals eat? (ages 3+)
Fri: Creature Feature (all ages), Sensational Senses (ages 3+)
Sat: Bugging out - role of insects in nature (ages 5-10), Peirce Estate Tour (1.5 mi, ages 8+), Predators and Prey (ages 7+)
Sun: Ranger-led horseback tour (ages 12+), Dumbarton Oaks (ages 8+), Sensational Senses (ages 3+), A Deer for a Day (ages 5+)
Museum of Natural History
Daily tarantula feedings in the insect zoo and museum tours.
Tue: Hands-on activities in the Dig It! soil exhibit
Wed: Look at specimens or artifacts with a scientist in the Ocean Hall