Hello moore5678,
Years ago I chartered a Moorings 4200 cat from their Marigot Bay base in St. Lucia. I arranged for a one way sail to The Moorings base in Grenada. The advantage of the one way
sail is you can cover twice as much territory. We did enjoy the Tobago cays for it's beautiful turquoise waters. Sunsail being a sister charter company most likely offers one way charters as well. I believe you will be charged an additional day of charter for the one way option. So, in a 9 day one way charter you can cover more territory than paying for a 10 day return to Grenada charter. Check with Sunsail advisers but a sail south ( St. Lucia to Grenada ) will be easier and more comfortable than saillng north ( Grenada to St. Lucia ). Hope this helps!