Nasty because of all of the construction going on.
Okay. Follow signs to SAnto Domingo as you leave the airport, as you near the bridges, look for signs that say ELEVADO . Go on the Elevado and as you come down, stay on the right and take the first right (be alert, it comes quickly) called Paseo de los Periodistas. Take the THIRD turn to the right, the first two are dead ends. That Third street will take you to Leopoldo Navarro, go right again. CAribe Tours is on your right at the corner of 27 de Febrero. (I am pretty sure you can take 27 de Febrero and get there too, but I have not been that way in years.)
From the corner of Caribe Tours, you go right on 27 de Febrero and go to Winston Churchill. Major intersection! Go right one block and turn right again. There on the left is Metro. You can go into the parking lot if you go left right after you make the right turn.You will see the entryway in the cyclone fence.
Hope this helps you...
HB