A rag-tag disorganized group of weekend hippies who exercise their first amendment right to gather on the 4th of July weekend. They illegally gather in groups of tens of thousands in remote, pristine areas of public land. Despite claims to "cleaning up after themselves," the Rainbows destroy protected wilderness areas often trampling upon endangered plants and making life difficult for endangered animals. While Rainbows pretend to be a non-organization, they act in an organized fashion to devastate environmental areas in the name of celebrating "Mother Earth." Despite some similarities between their belief system and First Nations belief systems, Rainbow Family members frequently trespass upon and desecrate indigenous sacred lands. They ignore the pleas of native elders to respect and refrain from gathering upon sacred locations.
Most Rainbows are well-behaved, but a significant minority steals to gain money to get to Rainbow gatherings. They will also shoplift supplies needed for the gathering. Given the extent of drug use among the Rainbow Family members, it is no surprise that violence is much more common than these "peaceful folks" care to admit. Rainbow Family culture is still far more sexist than they admit. The women do most of the work at the Gatherings. The men generally look to get laid. Rainbows are well known for permissive policies regarding drug use and sex. STD's, particularly disease resistant strains, are common among the Rainbows.
I hear it'll be decades before that part of the park recovers from that Rainbow family gathering; they have completely fucked it up.