I’ve done the Grenadines a few times. All out of St. Lucia. Once up to Martinique, 3 or 4 times south down to PSV and back to St Lucia and most recently from Rodney Bay one way to Grenada. All on monohull sailboats. All bareboat charters with the Moorings. The Grenadines are stunning. Bigger than the BVI in every way.... the seas are heavier, the winds are heavier, the sails longer, the islands more remote, more rugged, more mystical, more foreboding and probably more beautiful than the BVI. In the Grenadines you feel like you are on your own because you are- cruising without a net, but he rewards are marvelous. My highest recommendation is to do the one way from Rodney Bay to Grenada. It allows for more leisurely island hopping and will allow you to see Cariacou and Grenada- both fantastic. Also while sailing from the Pitons to Bequia is a thrill.... beating back up on the return trip is a little bit laborious, a rougher run, and it can be a concerning run if conditions are not ideal for the St. Vincent to St. Lucia run when you “must” have the boat back by a certain date/time. You want 10 days minimum