Locals call the waters that surround this seahorse-shaped island ‘mar de siete colores’ (sea of seven colors) but you may be too dazzled by glistening white sand and tall palm trees to notice. San Andrés lies a distant 480 miles (775 kilometers) northwest of mainland Colombia but only 93 miles (150 kilometers) from Nicaragua. Snorkel or scuba in crystal-clear bays and cays, soak up island vibes to a reggae soundtrack along Playa Spratt Bight’s beach promenade or wander the shops and restaurants of San Andrés Town.