Can you imagine?
For at least 10,000 years people lived right near the creeks and in the valleys of the East Bay. They had children and grandchildren, grew up, lived, and died, generation after generation.
They knew the carrying capacity of the land in its natural state. They adapted to it and survived intact as cultures and tribelets for thousands of years.
They also enjoyed unprecedented cultural stability. In his Handbook of the Indians of California, A.J. Kroebers’ studies revealed no signs of major upheaval in the archaeological record such as might be expected based on research into other ancient sites around the world.
What was it like?
Gather around water.
Gather around food sources.
Conduct ceremonies to maintain interconnectedness.
Procreate. Recreate. Births.
Deaths. Famines. Floods.
Earthquakes. Times of peace and prosperity.
In short, it was a life not so very different from our own.
For an excellent overview of their way of life read The Ohlone Way by Malcolm Margolin, Heyday Books, but keep in mind there is much still to be learned.