This is what the cdc has to say:
"Haiti: All areas, except no risk in cruise port of Labadee (Labadie). Dominican Republic: Rural, with highest risk in provinces bordering Haiti. In addition, risk in all areas of La Altagracia Province, including resort areas. There is no risk for malaria on the other islands listed." (
http://www.cdc.gov/travel/regionalmalaria/caribean.htm#malariarisk).
my opinion is that if you are just going to be at a resort or in the larger towns in the central and eastern part of the country, you would not need to take antimalaria pills. i would only take them if you are extremely concerned. you need to remember that antimalaria pills aren't 100% guaranteed.
antimalaria pills are not suggested for long term use and therefore foreigners living there are not taking them.
try using strong bug repellent (that contains DEET or Picaridin) instead of the pills if you are really worried. i would check out
www.cdc.gov/travel because it has a lot of information!
-Keri