This 23,383-acre island near La Paz is centered in one of the most biologically diverse marine areas in the world – and is a major environmental success story. Several plants and animals are found nowhere else in the world, including the blacktailed jack rabbit and antelope squirrel. Drop anchor at Espiritú Santo’s Bahía Bonanza for a day ashore. Take a guided walk among the tangle of exotic cacti, or swim, snorkel and kayak the crystal clear sea here that supports 900 species of fish.