Go to this web page from the US State Department for the answer to your question.
Here are some more resources for you:
some background from the Economist..
as well as OSAC..
and World Travel Watch..
Crime rate varies in the Dominican Republic, as in any other country. Areas such as the capital ( Santo Domingo ) are prone to more crime because of high population density. The areas with less crime are the North Coast towns ( Puerto Plata, Sosua, Cabarete, Cofresi, Cabrera ). This is the reason why tourism and investment has grown in the North coast, specially in Sosua and Cabarete. Sosua Villas are now famous worldwide, because of the quiet environment in the town and its beautiful beaches.
It's a good city
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them