From a full day up to 3 days I would suggest to visit this island that is a MUST if you go to Margarita. 

Here you will find white sand beaches, pink salines and all inclusive packages to drink and eat whatever you want.

To go to Coche island you can book a catamaran tour or a mini ferry which can takes  around 30 to 40 minutes from Margarita island. Here you can enjoy the beach or rent a jetski for 30-40 usd for half an hour. Also I strongly suggest to do the ATV quads tour around the island where you will find very interesting spots and viewpoints from the island.

Also if you have time, I recommend you to stay in one of its all inclusive hotels enjoying the pool, spa and the rest of the amenities this place has to offer.

Hotels are about 70-80 usd per night and I suggest to go to Sunsol hotel.

Make sure the tour you book includes pick up from your hotel or any place where you are staying in Margarita.

You can contact www.socoadventures.net where you will find all the information regarding the tour and customize it at your own way. Also you can chat with them by clicking the WhatsApp button on the website at anytime. You can also split payments so you don’t have to pay everything at once and finally but not less important they will take care of safety and logistics since you arrive in Venezuela.