I've told this to some of my foreign friends, The best way of finding a good girl for a foreigner in my opinion, is first to try to learn the language and culture a little bit before aiming for love, this is essential. the best way of doing this is to find trust worthy Dominican friends or at least acquaintances. I'm not kidding, and finding some decent Dominican friends is not as hard as some might think, just take a few courses in one of the universities, go to the gym etc and I'm sure you'll meet some decent people. Anyways, finding Dominican friends will allow you to eventually meet a decent girl, since here everyone knows each other, or knows someone who knows someone etc.. Among Dominicans everyone knows who's the puta, who's the cuero, who's the decent girl that hasn't had that many boyfriends, even the one who's saving herself for marriage (I know this might be hard for gringos who are use to cueros in Sosua to believe but there are many Dominicanas who do this) etc..
Dominicans love chisme, and your reputation means alot in which ever social circle you belong to. My point is that if you have good friends they'll advise you about which girls is "good" or which are just good for a one night bang. All of this might seem to be too much work for finding a decent girl, but if you intend to live in the country for a long period of time and find a significant other, then why not? You might as well mingle with the locals and learn how things work here. Although, if you plan to just come here for vacation or just a few months then forget everything I said and head to pasion, and all the other clubs remember to go for all the slutty looking Dominicans once your there.