Lassen Peak

One of my personal favorites and a hidden gem of California that keeps circling my mind is the Lassen Peak Trail. Don't let the trail map (2.5 miles one way) deceive you and make you think this is a short trail. The elevation gain is is 2000 feet from the parking lot to the end of the peak. The air is very thin so, it's best to take your time. The trail hike and switch backs are made worth it by the views and on a clear day, you can see Mt. Shasta on the north side of the peak. I've learned that hiking in the heat of the day was not the best idea since shade-cover is very limited, but definitely worth brining a hat and sunglasses. You'll also be greeted by the smell of rotten eggs since Lassen Peak is an active volcano, but remains dormant.

Fun history, it erupted between 1914 and 1917. So if you want to feel the adrenaline rush of hiking on an active volcano, this trail is the place to go. Also highly recommend going there at night to catch the stars. Lassen Peak is surrounded by campgrounds nearby so it's best to check with the rangers at the gate to see which campgrounds have availability.