From the SW Seattle Historical Society website:

Come join this family-friendly ride through history with the Southwest Seattle Historical Society.

It’s about 10 miles round-trip from the “Birthplace of Seattle” Alki Landing Monument at the intersection of Alki and 63rd avenues to the Longhouse of Chief Seattle’s Duwamish Tribe, whose members were already present when the Denny Party landed, and still are. Stops for stories along the way.

Arrive by 9:15 a.m. for sign-in and introductions. Children 15 and under must be accompanied by parent or guardian. Helmets required. No ear buds. We will obey traffic laws and yield to pedestrians on the trail.

This will be a Cascade Bicycle Club free daily ride. Leisurely pace (10-12 mph) on the Alki and West Duwamish Trails. We will stay together and stop to hear stories at Anchor Park at Duwamish Head; at the water pumping station on Harbor Ave; at the monument to the Croatian immigrant town of Riverside; and at Herring’s House Park/T107 park and the Duwamish Longhouse. Snacks and exploration there. Ride back. Bring or buy lunch at the beach if you can stay!