Re: St. Lucia to Grenada versus Antigua to St. Martin
i did one way Antigua - St martin a few years ago in late march with Horizon out of Jolly Harbour, Antigua and had an amazing time. I'm doing one way St Lucia to grenada (also with Horizon) late march of this coming year.
we took a full 8 or 9 days to do Antigua to St Martin. I would think 5-6 days pushing it a bit (and might raise some eyebrows with the chartering company), but you've obviously thought about it and want to do multiple days of long sails and dont care about the on-land activities, so maybe it would be fine as long as you didnt get stuck by weather (i would think unlikely that time of year) or any problems with the boat. i would say that it would be a shame not to see a bit of the islands, though, and checking in and out can take some of your valuable time as well. we encountered no real problems apart from a couple of days of northerly big swells which limited our choice of anchorages and if we had wanted we probably could have made it in 5-6 days. we really wanted to see Saba Is which was a highlight of our trip. still, i would think you'd want at least a week or preferably more to do it right and make the one way drop off fee worth it. i suppose you could do Antigua - nevis, then Nevis-Saba or St Barths, then Saba or St Barths to St Martin and that's only three days leaving you 2 or 3 days to play with, not counting the first day which is usually a write-off.
although i havent done it yet, i have been planning the st lucia to grenada trip for a 9 day charter. to my eyes it seems maybe a bit more straightforward and i would think easier to guarantee making it in 5-6 days, if you absolutely must. also dont have to worry about bridge opening times, as you must to Simpson lagoon if that's where you're returning the boat (i think sunsail does not have their base in the lagoon, so i suppose you could go with them, but i think its farther up and around the NW side of the island).