which is the best place to hike in California?

Avenue of the Giants or Yosemite! Put this question in Camping they will able to help you out better!

Yosemite.

California is huge. There are many beaches and National parks to choice from for a exceelnt hike. I would go to the Redwood Forest.

California is GIAMONGOUS and wildly diverse. There are thousands of amazing places to hike from beach and coastal trails to redwood and sequoia forests to low deserts and high, lava fields and caves.
Where in CA will you be? That might help narrow it down. Or what kind of hiking do you prefer?

Compton

PV Portuguese Bend Nature Reserve
https://www.yelp.com/biz/portuguese-bend-nature-reserve-palos-verdes-peninsula?osq=PV+portugese+bend