I was not under the impression that this group was forming to only combat litter. Heck the mission statement that is being developed includes a statement about educating and informing the hot springs visitors. I don't understand why would leave all that stuff out???
I would suggest ensuring the stuff people would be most interested in reading about (ettiquette, USFS rules, nudity, etc) up front. Keep the information about the group in the later half of the flyer. That way if they loose interest in reading it or don't have an interest in the group, the flyer will still serve its purpose to inform them.