I'm not sure what you are looking to do, but we hired a local, named Joyce Prince, to give us a private 3-hour tour of St. Maarten. It was well worth the time and money ($150). She has a new mini-van, and can take up to 6 people. We got to see sites that we wouldn't have otherwise, and she knew how to avoid the high traffic times and areas. The traffic at certain times of the day is horrible!
Joyce and her husband also own a rental car agency on the Island. My husband learned about Joyce after reading rave reviews about her on another cruise board. We were actually her first Disney "hire".
We had lunch on the ship after our tour, and then headed to the beach for the afternoon. I felt like we really got a good taste of St. Maarten.