Several kilometers west of town on the way toward the entrance of the Parque Nacional del Este is Cueva de Berna , a large cave with scattered Taíno pictograms (and graffiti) and stalactite and stalagmite formations. A caretaker usually sits outside the entrance and will gladly accompany you up the rickety ladder and deep into the cave (a small gratuity is appreciated). To find the cave, follow the paved road that runs along the ocean wall west (away from the mouth of the river); you need no more than 15 minutes inside.