Here's good advice. AT first I thought it was weird, but then it made more sense.
You are generally safer in the presence of Dominicans. If you find yourself totally alone, be very very careful. Especially when out walking or something.
I was out walking with a neighbor in AUgust when I still lived in Cabrera. All of a sudden we looked at each other and realized we were totally alone. Around the next bend were two pretty creepy looking guys apparently squatting in an empty house. We picked up the pace and got out of there quick. And she was a local!
Don't go anywhere alone at night. If you go out with a group go home with the same group. If you decide to have some drinks for heavens sake order plenty of water and don't make a fool of yourself.
If you don't have the proper change for your concho, tell the guy to come back in a bit when you have made change. Don't do what I did--give him my 50 bill and asked him to return. That was my 30 peso lesson!
DON'T listen to any Dominican men who will undoubtedly start yammering away at you withing seconds of your arrival. Ignore these jerks. Also, married men will hit on you in this country. I did my best to ignore it but it is a fact of life. I was out of the single guys age bracket for my town so all I got were jerks and married guys. It can be frustrating but I knew I wasn't there to find a man so I carried on!
Be super respectful when invited to someone's home. Don't fill your plate too much with food because you will be served more at some point. Take time to listen to the elders in the home and show respect. Hand squeezing and sincere thank-yous go a long way with older folks. I have been known to say "bendicion" to people who treated me very very kindly.
Don't dress too flashy! You'll have a hard enough time disproving the "all gringas are sluts" theory. Classy not flashy! Find a classy girl in your new environs and copy her if need be! Dominicans dress nice, smell nice, look nice, have their hair and nails done. Acclimate!
People will want to know about you, and all I can say is be careful who you share information with at all times. Guard your privacy, and your personal possessions. Don't let someone in your house unless you know them. As soon as you get a phone get some reliable numbers programmed in that you can call if you need help/in case of emergency.
That's all I can say, and I am no expert. Good luck.