We spent three nights at Lassen NP.  We stayed in Manzanita Lake campground.  We drove around the park every day as we explored it.  We hiked the three mile out and back to Bumpass Hell, and also to Mill Creek Falls.  The trail to Kings Creek Falls was closed for repair.  We enjoyed all of the volcanic related features.  The park has all four types of volcanoes and some obvious evidence of volcanic activity.

The park is actually McArthur-Burney Falls Memorial State Park.  The highlight of this state park is Burney Falls.  It flows in two parts: over the falls, and through the rocks behind the falls, which gives it the unique curtain-like appearance.  This is because of the rock structure behind it.  This time of year, June in a dry season, the falls flow just fine but the stream that feeds it is completely dry a mile upstream from the falls.  The water comes through the gravel between two layers of volcanic rock.
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The park also includes Lake Britton on the Pit River which has a popular boating and beach area.  Many who come to the park are there for the lake with the falls a nice diversion.  There is a little hiking there but not a lot, so the combination of the lake and the falls seems nice for those who like them.  Next time, we will bring our folding kayak, too.