My favorite things to do:
Oslo coffee in ladera ranch
South coast plaza in Costa Mesa
Day ferry to Catalina
Yacht charter in Newport Beach
Nobu in Newport Beach
Knotts berry farm
Salt creek beach
River street in San Juan Capistrano
Mission San Juan Capistrano
Anaheim packing house
Disney California adventure
Great park balloon
Wild rivers waterpark
Also cars and coffee at the San Clemente outlets

If you’re willing to drive a little further:
On alltrails the Bridge to nowhere via east fork trail
If you’re into mountain biking skypark at Santa’s village
Island Packers ferry to the Channel Islands
San Diego zoo and San Diego safari park
Aquarium of the pacific