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Also...look for berries with Sierra Club or the Wanderbirds; for chanterelles with the Mycological Association; for bats with the Audubon Naturalist Society; or for geese with the Anacostia Watershed Society, or many other activities:
Sierra Club
Sat: River Bend Park (3 mi)
Sat: Glen Echo and towpath (5-6 mi)
Sat: Matthew's Arm (fast-paced 9.7 mi + swimming hole)
Sun: Signal Knob (11 mi + blueberries and swimming hole; leaves from Vienna Metro)
Sun: beginner backpacking class
Potomac Appalachian Trail Club
Many cabin and trail crew work trips.
Tue: Appalachian Trail in PA (17 mi); Family Hike at Great Falls (3.5 mi)
Center Hiking Club
Sat: White Oak Canyon (from Vienna Metro)
Sun: Dumbarton and Taft bridges via Rock Creek Park (3.5 mi, from Dupont Metro)
Capital Hiking Club
Sat: Stony Man/White Oak Canyon/swim (7.3-9.4 mi; bus)
Maryland Outdoor Club
Sat: Day Hike at Gettysburg Battlefield
Northern Virginia Hiking Club
Sat: C&O Canal: Monocacy River to Calico Rocks (10.8 mi); Overall Run/Heiskell Hollow in Shenandoah NP (10 mi)
Wanderbirds
Sun: Berry hike and ice cream social (13-15 mi; bus)
Washington Women Outdoors
Sun: Mason Neck (3.5 mi)
Wed: registration deadline for Three Ridges Backpacking trip (July 17-19)
Audubon Naturalist Society
Sat-Mon: Natural heritage weekend in West Virginia
Sun: Blockhouse Point Conservation Park
Mycological Association of Washington
Tue eve: Monthly meeting; presentation on toothed fungi
Sat: possible foray at Lake Bernard Frank (check website)
Rock Creek Park
Sun: Milkhouse Ford hike (1.5 mi; ages 8+)
Sun: Ranger-led horseback tour (ages 12+)
Kenilworth Aquatic Gardens
Sat: Gardens open at 6:30 AM; bird walk at 7:30 AM
Sun: Garden tours
Anacostia Watershed Society
Tue-Fri: Count Canada geese for the National Park Service
FOR KIDS
Audubon Naturalist Society
Sat: learn how Native Americans used their environment (ages 4-6)
Sat eve: Bats and bugs night hike (ages 7+)
Rock Creek Park
Wed: Art in the Park exploring wildlife (ages 5+)
Thurs: Nature journal (ages 5+)
Fri: Creature Feature (all ages)
Sun: Milkhouse Ford hike (1.5 mi; ages 8+)
Sun: Ranger-led horseback tour (ages 12+)
Potomac Appalachian Trail Club
Tue: Family Hike at Great Falls (3.5 mi)
Museum of Natural History
Tue: Dig It! The Secrets of Soil activities
Wed: Ask an Expert in the Ocean Hall