Some of California’s best and most accessible diving is in this reserve, accessible from La Jolla Cove and La Jolla Shores. With an average depth of 20ft, the 6000 acres of look-but-don’t-touch underwater real estate are great for snorkeling, too. Ever-present are the spectacular bright-orange Garibaldi fish – California’s official state fish and a protected species (there’s a hefty fine for poaching one).

Further out you’ll see forests of giant California kelp (which can increase its length by up to 3ft per day) and the 100ft-deep La Jolla Canyon. A number of commercial outfits conduct scuba-diving courses, sell or rent equipment, fill tanks, and conduct boat trips to nearby wrecks and islands.