All the three caves are located in Karst region of Puerto Rico at about 1.5 hours driving distance from Old San Juan. Rio Camuy caves are magnificent. The caves are located in a 268 acre park. The park only allows a certain number of visitors in a day. So it is best to get there before 10:30am. They give 2 hours long tour to the caves explaining history, geography and formations in the caves. It’s totally worth it and costs 15$ per person.Cueva Ventana also known as window cave is located at a a short drive of 30 mins on route 10 from Riocaves. Entry fees is 10$ per person and the view at the end of hike is amazing. If there is still time left pick between Arecibo Observatory and Cueva Del Indio. Arecibo Observatory is known for world's biggest and most sensitive radio telescope.Intersting fact,when I saw it I realized James Bond- The Golden Eye was shot there. Cueva Del Indio is famous for petro glyphs. I was amazed to see the rock formations in the ocean near these caves. Beautiful arches rushed with high waves looked spectacular. A must see totally.