On the second day, venture into the caves and cliffs of Hundred Islands National Park. Start with a visit to the Imelda Cave, known for its unique rock formations and underground river. Explore the cave's chambers and learn about its geological history. Afterward, head to the cliff diving area in Quezon Island. Take a leap of faith and experience the thrill of cliff diving into the clear waters below. If you prefer a less adventurous activity, you can also go kayaking or paddleboarding around the islands.