Try "Afoot and Afield" hiking guides for San Diego, OC, LA or Inland Empire. Great detailed info for long and short hikes of all degrees of difficulty. For many years, the author was Jerry Schad, but Scott Turner has been taking over. Remember, all who wander are not lost!
Buck Gully is a nice short hike right in the middle of Newport in the hills above Corona Del Mar.
5.25 mile loop with fantastic views of Catalina and Newport Harbor from the top. If you’re near there and want to get in a couple of hours it’s a great choice.
Humber Park to San Jacinto peak will kick your ass (not in winter)
Ladder/Painted Canyon in the Mecca wilderness (not in summer)
My place to the liquor store (anytime)
. Laguna Coast Wilderness.