The only place I found [3 years ago] "Parada 77" SD Colonial Zone, where they play salsa more often, in between other genre.
Not even the place owned by famous dominican salsa singer, El Canario, play salsa as the main genre - located near Parada77
At any other place in DR they play salsa if you insist...
This time I will stay in Puerto Rico, before arriving to DR, where they have exclusive salsa dancing places. From wednesday to Sunday there is always a place to dance salsa.
btw, salsa dancing is my hobby so to speak, good for the mind and body