You can also visit Corona Del Mar. It can get a bit crowded but a beautiful view of the sunset makes it worth it.
Corona Del Mar has my vote but it will be busy and parking will be tough. Good luck enjoy.
If you get there early enough: Crystal Cove State Park, Heisler Park or Vista park in Laguna Besch, Lantern Bay Park or Doheny State Beach or Ocean Drive in Dana Point.
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