Eagle's Nest is more of a viewpoint than a hike, but you can make it into a hike if you feel adventurous. There is a sign when you reach the turnoff for the viewpoint so it isn't hard to find. At the trailhead, there is a pit toilet. There is a signboard with no information on it at the beginning of the trail.
At the viewpoint, there is a rock wall that acts as a barrier from the steep drop-off. From here, enjoy a vista of the valley that houses the north fork of Ahtanum Creek and across to Foundation Ridge. There is a trail that follows the barrier in either direction. The rock barrier eventually turns into a wire chain barrier.
If you head west, the trail meanders along the barrier until the barrier ends. The trail peters out at the edge of a large talus field.
Heading east, the trail again follows the barrier until it ends. Then the trail largely disappears. Though there are signs of boot paths, please stay to the true trail, and avoid going off-trail.