Definitely at the Ocean Institute. Once you park there is a small drive on the right side of the Institute. Walk that way and go down the caged in stairs towards the beach. Once you are on the beach go right and walk all the way to the end and the caves are tucked back in there. Be cautious when walking on the rocks. They are filled with lots of life. It's pretty cool to look at all of the tide pools while you make your way to the caves.
The best place to park is just outside the Ocean Institute.
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