Thanks for the replies. We went to Tribeca and Dolce.
Both were crowded with a young crowd... around 18-30.
Tribeca is much smaller and played only Salsa, Merengue and some Bachata. They charge 500+ pesos for a Grey Goose and OJ! (5000 pesos for a bottle)...and plenty of people were ordering them. Very affluent crowd...especially considering the average age.
Dolce is about twice the size, had a much more mixed crowd and drinks were more reasonable. They also played more "American" dance music.
I've been to Zoom before...it's tiny and ridiculously over-priced.
We also went to the "after-hours" disco at the Hotel/Casino Gran Admirante... also VERY tiny, absolutely packed, but kind of fun....and open until 5 am.
We ate at Paparazzo...next to Tribeca. Excelent food and impeccable service, a little pricey, but not that bad (relative to NYC or Miami...or even Santo Domingo and Cabarete).
We stayed at Hotel Casino Matum. Rooms were quite large and on par with say, Aloha Sol...but the front desk service was truly horrible. We were quoted 1830 pesos, tax included on the phone...when we arrived, they tried to charge us 2500 pesos...after a few minutes of arguing and a threat to leave, they agreed to the quoted price - which was confirmed 3 times prior on the phone...ridiculous... especially as we're looking at a plaque in the lobby proclaiming their dedication to excellent service. Also, there is no breakfast included...and nowhere close by to get breakfast, although it is a great location otherwise.