Camping at Mt. St. Helens

My husband and I are planning to tent camp up at St. Helens this weekend. We've been planning on the S/SE side for trail access, and I notice there are several campgrounds in this area. Anyone have any recs? We're looking for pretty and quiet, preferably with a shower somewhere in the vicinity. I've googled a bit, and it seems like those campgrounds are the few in the area without websites/photos.