The 16,682-acre Brothers Wilderness lies within Olympic National Forest and occupies a blip of land on the eastern flank of Olympic National Park [1]. Wilderness permits are not required in the Brothers Wilderness.
Only a few developed trails exist in the wilderness; the primary one is the Duckabush River Trail, which begins a mile up from the Collins Campground in Duckabush Recreation Area [2]. The trail climbs six miles to the park boundary, with a view from Big Hump rock. Once inside the park, you can connect to a maze of other routes through the high country.
From Lena Lake Campground [3] on Hamma Hamma Road, a hiking trail leads uphill to Lena Lake on the edge of the wilderness, and then on to Upper Lena Lake inside Olympic National Park [1]. This is a perfect overnight backcountry trip.
Links:
[1] http://www.moon.com/destinations/washington/olympic-peninsula-and-the-coast/olympic-national-park
[2] http://www.moon.com/destinations/washington/olympic-peninsula-and-the-coast/hood-canal/eldon-brinnon/sights/duckabush-recreation-a
[3] http://www.moon.com/destinations/washington/olympic-peninsula-and-the-coast/hood-canal/eldon-brinnon/sights/hamma-hamma-recreation