We live on our sailboat in the Caribbean for 6 months and are here now so we kind of know the area <img src="http://www.traveltalkonline.com/forums/images/graemlins/Grin.gif" alt="" />
Colombier is ok but avoid the place if there are northerly swells and northerly winds. There are a few moorings but those are usually full so you might have to wait a day or so for a free one. However in May June you should have better luck. You can run/walk to a bakery from the Colombier anchorage if you like a long hot journey.
There are lots of places to explore on St. Maarten and St. Martin too so you won't run out of places to visit!
Have a great trip.
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