The PCT through the Mount Adams Wilderness is a spectacular section of trail. I only had 10 miles to hike along the PCT and threw in a two-mile detour to get closer to the Adams Glacier.
Day 4: Panther Creek to Lava Bed Camp
12 miles, 3000+ feet of elevation gain, only a handful of other hikers, and lots and lots of trees! Day 4 on trail was a challenging one, but also included some great rewards.
Lassen Volcanic National Park offers an awesome exploration of all things volcanic. The main highlight of the park is Lassen Peak, standing proudly above the surrounding geology at 10,457 feet high.