As someone who has been traveling to the Dominican Republic for the past 19 years, I can enthusiastically tell you that the people of the Dominican Republic are amongst the friendliest, most hospitable, and full of life people that you will ever meet.
You can see some of that "spirit" in my "People of the Dominican Republic Photo Gallery" at this link
People of the Dominican Republic.
It is the number one reason why I keep returning.
You will have a great time.