I have a feeling you will not enjoy your visit to the DR a lot because you are so worried about scams and want to know every small detail...live a little and relax, you only live once!
Just my 2 cents...
not everybody was built to leave home. i once went to the airport to pick up a guy who was making his first trip to the DR. on the way back to the hotel, he wanted to stop at Wendy's. he was miserable for 4 days, because i refused to go hunting down American franchises in Santo Dgo for everything he wanted.