A breathtaking 136-acre stretch of pristine Northern California coastline newly handed back to Indigenous tribes is proposed to become a place for ceremonies — and for teaching younger generations how to live off the land and sea. The rugged Mendocino County property — which includes Blues Beach and an ancient village site known at K’etim — was transferred by California transportation officials to Kai Poma, a tribal nonprofit, after a decades-long battle to reclaim the ancestral land. The nonprofit represents the Sherwood Valley Band of Pomo Indians, Round Valley Indian Tribes and Coyote Valley Band of Pomo Indians. Sign up for…