Been going to SXM since 1988. In 2010 we forgot to spray our room with insect repellent and go out for a beer or two. Got bit there or somewhere and got Dengue Fever. Was one sick person. Fortunate for us the rough symptos didn't show til about two days before we left. Once home saw our Dr. and he took care of things. NOW! We spray every thing every day. Use bug spray with high deet content and use dryer towellets to wipe on all skin areas and even tie small pieces to belt, hat, shoes and whatever. Been great ever since. Many resorts and places have the insect repellent at the front desk if you need it before you go shopping. Products are improving every year.

Good luck and just prepare.