The Lake Shore Trail at Olympic National Forest, WA, is an easy 2.2 mile out-and-back hike that brings you along Lake Quinault.
This trail leads from the northwest corner of the Rain Forest Nature Trail, thus requiring an extra 0.2 - 0.3 miles in addition to the 2.2 out-and-back miles.
When I did this trail in mid March 2017, the lake's water level was so high that it flooded the trail, so the GPS data provided is only 1.1 miles out-and-back, instead of the full length of the trail at 2.2 miles out-and-back.
When you're heading northeast on the trail and come out by the campground, follow the campground's road (stay left) until you reach campsite #6. Just beyond campsite #6 is the continuation of this trail.