Whalen Island County Park and Campground has some very peaceful trails around South Sandlake Estuary. There's a fairly easy loop hike with some quiet beach access and very little elevation change. We started from the circle parking/restroom area, heading North, and returned by the edge of the campground.
For more recommended things to do in this area, search google for "Intentional Travelers Pacific City" to find more info on our blog :)