If you travel to Colombia you have to visit Parque Tayrona, the most beautiful beaches in Colombia with turquoise water: Bahía Concha, Playa Cristal, Taganga... It's just the paradise. But you must suffer to get there. I mean, as it is a preserved area you can get there only by boat, some people walk; Taganga is more accessible than the others, you can get there by bus, but to go to the beaches it's possible on foot or by boat. Don't go to Playa Grande in Taganga, it's always crowded. In Bahía Concha and Playa Cristal you can do snorkeling, and you will see amazing things under the water. To BC you can also get by motorcycle or cars local drive. Hope you visit this place some day!