To get to the island you need to take a Penero (small boat).
You can schedule the time, and they take you and pick you up.
You can get them at the beach of the coast all around Mochima,
The ride from playa Colorada it is 5 min and you will see and amazing landscape during the ride
On the town of Mochima you will find Peneros (littler boat) that can take you to most of the diferent beaches of the Park of mochima depending of how far you go they will charge you.
Mochima town to Playa Blanca 15.000 bs for person