Cayo Levisa is 4 km long and accessible only by ferry which takes about half an hour. For day visitores buffet lunch in the hotel is included in the ferry ticket price.
You get to the island only by ferry from Palma Rubia in the morning. In 2014 it was at 10 a.m.
Best during the dry season roughly from November to April but this is also the peak season. Shoulder season May and June is worth a try, less crowded but showers may occur