Note: The tide greatly determines if you can get into the sea caves. You cannot access them during high tide.
"Sunset Cliffs lies south of Ocean Beach and has several beaches below. Named for its exquisite sunset vistas, Sunset Cliffs Park encompasses 68 acres of bluffs and walking paths high above the wide expanse of the Pacific Ocean.
With its rugged coastline and panoramic views, this area is popular with surfers, ocean-gazers, and folks who like to cruise Sunset Cliffs Boulevard, which runs the length of the cliffs.
The drive along Sunset Cliffs Boulevard, which begins at Adair Street and continues south to Ladera Street, offers breathtaking views and photo opportunities. It also makes a nice bike ride or walk, and it’s a great place to watch birds. You can see migrating California gray whales during the winter months from high on the bluffs."
Personal Experience: Many of the cool caves cannot be reached unless it's super low tide. There is no way in them otherwise unless you swim and that's obviously not safe.
I recommend going on a low tide day and just walking along the shore. There are many caves to explore, including a couple quite large ones. The best cave here, Rum Runners Cave, I have finally explored and given it its own page!