Just a short distance before you come to the Big 4 Picnic area you will come across the Beaver Creek group campground. Its a very small site with limited amenities but incredible views of Big 4 Mountain and great access to Beaver Creek and the South Fork Stillaguamish River. It makes for a great basecamp for alpine hikes like Mt Dickerman or the Ice Cavers. If you are in the area, its definitely worth checking out but it is a reserve only site so plan accordingly.