We did a day trip in March and initially we planned on doing a catamaran trip, however, the schedules did not work for us. So, we went by ferry from Marigot and hired a taxi and it was so easy. I would definitely do that again as I liked the freedom to choose when I wanted to go and return and where I wanted to go on the island, not to mention choose where I wanted to eat and drink. I am sure the catamaran is great but if you want to do your own thing, it is so easy and you will have no problem getting there or back or getting around the island.