One of best places I’ve been to. I’d definitely recommend several days if you can as some of the trails are pretty challenging though definitely see the spatter cones and the one before it (can’t remember the name but big black hill you can climb even if not in great shape by taking a break every 50 feet or so. Most unique and gorgeous campground with helpful staff. Most spots have at least a couple sides completely blocked off from other spaces. No designations so you can take as big or little of a spot as you want with everything from pull-through s to tent sites with just parking for a car. Recommend to arrive between noon and 3pm for most options to pick your spot. Planning to go back for maybe even a month later on though have to switch spaces after 14 days. Off-season has no running water but vault toilets are clean. If you have handicap/senior access pass, only $4/night off season. If not, you have to also pay park access fee daily. Payment is one-day only so have to go get new receipt from machine every day but close enough for easy walk to entrance.