Check out Wilder Ranch in Santa Cruz. Old Cabin has ~4700: https://www.strava.com/segments/3974284
Here is a famous one in Santa Cruz, Emma McCrary trail (EMT), ~6900: https://www.strava.com/segments/4800253
And the EMT connector trail called U-Conn ~4970: https://www.strava.com/segments/982591
People often connect EMT and U-Conn.