Washington's best trails for hiking are found along Snoqualmie Pass, which is not far from Seattle and the greater Puget Sound area. There are dozens of hikes you can do. My favorites are Snow Lake (near the base of Alpental ski area), Franklin Falls (near Denny Creek Campgrounds) and Denny Creek.
Franklin Falls easy hike Franklin Falls is a nice trail and a hidden gem...the entire trail is about 1 mile (no signs) and the waterfall sight is purely beautiful. Franklin falls is one of the easiest hikes you can do. The trail is not far from Denny Creek Campground. As you pass the camp-ground, just turn left into FR 5830 and park before crossing the bridge.
Anywhere along the Pacific Crest Trail is great, though Kendall Katwalk Trail is one of my favourite hikes in the Snoqualmie area because of its easy access right off I-90. Best doing this hike in the summer when the snow is gone.
Are there places along the trail for camping? If so, do you need to stop somewhere for a pass or can you just camp wherever you want along some of these backpacking and hiking trails?
There are spots to camp out along the PCT but some places on the Pacific Crest Trail require camping permits, as well as overnight use permit of the trail.