There are many options for island hopping on catamarans and sailing vessels. I enjoyed my solo cabin from sxm to guadeloupe sail (with a second week option further south before a transatlantic sail waving goodbye to the end of the season) and am looking at grenadines options for december/january. It's a lovely experience with daily tender to port. I recommend you explore this option without hesitation.
Some charters offer solo cabins such as Dream Charters out of Anse Marcel, I believe.
all the best
C
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