Reputable Touring Company? Recommendations please

We will be a group of 10 (6 adults, 4 kids (ages 8-14)) arriving to St. Maarten the first week of April 2016.

All of the adults have been to St. Maarten 2-3 times, but mainly hung around Philipsburg. None of the kids have been there. This time, we're looking to see more of the island... mainly Moho beach and Orient Beach, and any other MUST see places.

We are in port from 8am until 5pm. I would like to use about half the day on a tour, and finish by browsing Philipsburg with maybe a swim on the beach in front of the "boardwalk" as well.

Anyway. Looking for recommendations. Optimally, we would love to have a dedicated driver that would be ours for 4 hours or so showing us the sights. Not sure if this is an option. Otherwise, any other recommendations for "cookie cutter" touring options that really hit it out of the park for you?

Kindly, and thank you in advance...

Dan