- On both Saturday afternoon and Sunday morning, a Rock Creek Park ranger will lead a hike "In the Footsteps of Giants," telling tales of the 5 presidents who used the park extensively. Free.
- Saturday at the Patuxent National Wildlife Refuge, a ranger will lead a program on bald eagles. Look for them soaring over the refuge and get an idea why they were chosen for the Presidential Seal. Free, but reservations are required.
- On Monday, the Audubon Naturalist Society is taking advantage of the holiday with a walk along the C&O Canal from Great Falls to Carderock. Registration required: $23/32.
There are lots more events this weekend on our calendar