se depende
Like with anything, it all depends. Do you mean a live tipico merengue group? If that's what you want -- three guys playing classic merengue, you can walk down the block, sit at an outdoor table in el parque colon and drink all the cold beer you want. Sooner or later, a merengue trio will stroll over and play just for you. Similarly most nights along the malecon there are strolling merengueros and many cold beers.
Or do you want something more formal... a live band with a stage show, etc? Do you want jazz, rock, bachata? It all depends.