Isaac Evans Park and
Suspension Bridge
Green River Trail
Isaac Evans and Dykstra Parks are at the bottom of the map on opposite sides of the river, joined by the suspension bridge.  The partially developed Green River Trail through Brannan Park goes north from there.  Near the top of the map are a bike bridge and the 277th Street corkscrew hillclimb.
The trail in Isaac Evans Park allows you to get up close and personal with the Green River.
The bridge is an old plank span.  Be sure your tires are wide enough for the gaps.
Besides the river, you get a shady park with huge maple trees and other greenery.