If as you mentioned you are not familiar with the DR or Sosua, I can only suggest that you come down for a while and have a look around before making any decisions. There are existing businesses for rent and/or sale. You must take into consideration that the "ALL INCLUSIVE" concept which is so popular is not helping out the local bars/restaurants. We can only hope it will GO AWAY. (I doubt it). Anyway good luck with your venture and , who knows, you may do GREAT.
Eddy