When you go out the gate, cross the highway and flag down car with red box on top or the van, probably loaded, that toots to see if you want to be picked up. The car goes to Sosua and no further, the van keeps going. But when you see the big supermarket, Playero, you will know you are in Sosua. If in the car, go to the end, just a little further, so you will know where to go to get a car to go back. If in the van, get off at Playero, cross the road, and follow the street that you see at the stop light into town.
When you want to go back, walk up to the highway and flag down a car or van, which we call guagua
If they don't stop, it will only be because they are full.