The caves are located in the Callejon de la Loma, to get there you take the street across from the Ocean Dream plaza and go down the road about 1.5km... you will see a little stand office that acts as the start of the tour....the guides explain about the plants, animals, and history of the DR, and you also tour 4 different caves....takes about 2hrs and is extremely informative....I used to guide there, and its a good educational tour....its something to do when its raining...and let the guys know you got the info from DR1
hammerdown
ps if you need more info let me know