One of the two ways to get to Isla La Tortuga is by private plane... which I don't own. The other is by yacht, whichI don't own either, on top it takes about 4 hours to get there and costs a fortune. A trusted friend recommended a the aerotaxi of a charming Frenchman based in Puerto La Cruz: Jean-Luc Tersin. He flew us in his wonderful 6-seater Cessna 2006 and treated us to a low-flying tour of the island before landing on the sandy airstrip: an experience I'll never forget. Jean-Luc charges 200$ per flying hour, which is the necessary time to get to la Tortuga and back.
Ok, thousand islands to visit is an exaggeration - but offshore there are really several islands - rocky, not flat - to visit. The most impressive belong to two group of islands. the Islas himanas and the Islas Borrachas. To visit them you'll need a boat (lancha). From some piers you can rent a "trip" to one of the islands - or else you can join a diving-trip and travel past many more islands and beaches - with some occasional stops