a female friend of mine in her late twenties who speaks good spanish is looking for the right place to stay for her vacation....She would really like to be where the party is at ;-)(typical dominican music..dembow, salsa, bachata etc) but does not require a perfect beach. So I was thinking she should probably go to the north coast. Is this the right recommendation?
I only know about your friend what little you have posted...she may be a responsible mature safety concious woman who won't do dumb things and therefore will be generally quite safe...
OTOH, she may also be a naive and ignorant woman who assumes the DR is a tiny idyllic island full of innocent and friendly natives incapable of doing any harm to anybody...so she may go on party hopping in arbitrary places at any time, befriending any local that crosses her path...in other words, she could be a disaster waiting to happen.
The SAFEST way to do the kind of partying she may be interested in is by staying at the 'right' all-inclusive resort...for example one with a big disco open to the paying public....As long as she resists any temptation to go off-site with people (local or not) she barely knows, she could have a lot of fun partying while being quite safe (assuming she does behave with a modicum of common sense even inside the resort).
A perfect example: The Occidental Grand Flamenco in Punta Cana...it has one of the main discos (Mangu) of the area, which is frequented both by guests of the resort, locals, as well as tourists from other resorts...The lower level emphasises Dominican/Caribbean music (reggaeton, bachata, merengue, a little salsa), while the top level is more international...The local boys (a.k.a. sankys) will give her plenty of attention (if she wants it) but will keep a distance if she UNAMBIGUOUSLY let them know she isn't interested...the key phrase is NEVER to leave the resort with a local boy no matter how 'harmless' he looks... A much safer way of "getting friendly" with local men would be to focus on those who are guests in the Occidental resort (there are some, probably of middle to upper income level, especially but not exclusively on weekends)....male employees are best avoided since they have plenty of restrictions inside the resort, and may want to talk her into going off-site for "privacy".