What am I looking for by means of suggestions? Well, I've heard that there are either blue or red taxis. One goes to Cabarete from Sosua, the other goes west. Is that correct? I'll take any suggestions.
Ok, I got it now.
What you are in fact talking about, are public cars, not taxis.
A taxi from Sosua to Puerto Plata, for instance, would cost $25 to $30 US.
A public car, would cost $1 US.
All you have to do is stand on the side of the road to get one.
They will stop to pick you up.
Try to find out the real price to your destination, from a passerby, then have exact change, otherwise, they will try to charge you more.