Once you get past the two to three Km to the west bound side of Autopista Las Americas, either on foot or taxi, you look for a place where buses are stopping. Then walk up to the guy who looks like he is in charge and say, "Guagua para Parque Independencia." Then wait until he tells you to get on the bus. It was about 100 pesos about three years ago. I haven't done it since then, because my wife made promise to quit, but that worked during daylight hours. I might be afraid to do it at night. As Mm530 says uber is cheap. Before the agreement between Uber and LRD that I read about recently it was under 1000 pesos to Plaza Luperon, if you waited for the price, and that's practically all the way through town.