General: There are several options here: RV and tent camping, and cabins. As members of Harvest Host, we were able to stay here for free with the expectation that we would patronize the business.
Site Quality: The tent section is behind the cabins, but RVs park in the gravel parking lot with no clearly defined spaces. The section at the top of the fence away from the trading post appeared to be level but otherwise, the lot is sloped. We opted to park closer to the trading post in our campervan, which was also closer to the pit toilet.
Bathhouse: During the high season, there is a bathhouse and shower, but it was not open when we were there, but the pit toilet was very clean. When the trading post is open (9-5, later in the summer), there are restrooms inside.
Activities: There is a trail to the ice cave (short but there are stairs) and a loop trail leading to the volcano (about 1.5 miles but wear sturdy shoes and you should be in reasonable shape). It was recommended that we do this hike in a counterclockwise direction and this was good advice. The fee is $12 for both and there are markers with an interpretive pamphlet explaining the history and geology of the area. There is a trading post with souvenirs and a small kitchen area where you can purchase some food and beverages.
We were the only campers there on a VERY cold late March night so I imagine it would be very different during warmer months. We only heard an occasional car but otherwise, it was very quiet, and the night sky was beautiful. This is a family-run business, and everyone was very welcoming.