Hi Rebecca. I can't really help that much with Saba, but your dates are off. If you arrive in Saba on a Friday and spend two nights, that would be Friday night and Saturday night. Yet you state that you will be coming back to SXM on Tuesday??
Do you have a timeshare week you're working around? To ME, I don't think I'd want to travel again, the next day after arriving in SXM, but it's your choice.
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