i think one of SXM's biggest perks is being able to easily visit other nearby islands

Tintamarre is just a deserted island...Pinel is closer and has amenities

the other islands you mention are actually other "countries" (i use the term loosely)...much more to explore and experience there...Saba is really nice if you want a completely beachless excursion, as there is literally no beach (unless you count the tiny man-made one by the airport)...best to hook up with a taxi driver at the airport and have them give you a tour of the island...Anguilla is easier to get to and has some awesome beaches....i would just rent a car at the ferry terminal, and explore the whole quiet island at your own pace