North on Trail Ridge road from Grand Lake, past the Green Mountain and Coyote Valley trailheads. Bowen-Baker is on the west side of Trail Ridge. Starts very easily and then gets progressively more difficult, but even wussy hikers like me can get to some great scenery.
Wear good shoes, lots of rocks.
The Bowen-Baker trail leads from Trail Ridge Road across the Kawuneeche Valley and into the Never Summer Wilderness Area. It is heavily forested but with many places where you can get down next to this creek.