Three days in the sulfur-scented cathedral of Bumpass Hell—a 1.5-mile descent into hissing fumaroles and mineral pools that steam like a fever dream—followed by afternoons soaking in the naturally heated spring-fed pool at Drakesbad Guest Ranch, where the water runs 106 degrees and the Sierra pines frame the sky. Nights at Lassen Mineral Lodge in Chester, a 1920s timber lodge with stone fireplaces and deep-set windows, then a final evening with Lassen Dark Sky Festival rangers: a guided stargazing ritual on the lodge's meadow, red-light flashlights, the Milky Way so vivid it casts shadows. A bachelorette as geological pilgrimage.
Five quick questions, then we build the full itinerary — lodging, daily schedule, dining, bars, the group-chat message — and drop you into a Trip Room you can share with the crew.