This five-star PADI diving school offers two-tank dives in the Islas del Rosario, including transportation, equipment, lunch and instructors, for COP$408,000. Discounts of 10% are available if you pay in cash.

It also offers one-day mini-courses (COP$428,000) and three-day open-water courses (COP$1,578,000). Dive boats leave daily at 8am and return around 4:30pm. Book one day in advance.