There are about 15 hotels in La Vega. Try the Quinto Patio
at 809 573-6842 or the Hotel Buenos Aires at 809 573-5120. I would just go there and pick one. You should be able to get a good room for $5 to $15 per night. Have fun.
The disco is ASTROMUNDO on Autopista Duarte if it is still open.
