Visitors to the Underground River get a mix of dramatic natural scenery and unique wildlife. The highlight is the boat ride through one of the world's longest navigable underground rivers. Inside, you'll see vast cathedral-like chambers, dark tunnels, and calm flowing water. The stalactites and stalagmites form fascinating shapes. The cave chambers create a surreal, almost otherworldly atmosphere. Expect to see bats resting on the cave ceiling and swiftlets flying in and out the cave. Their sounds echo throughout the cave. Before reaching the cave, guests pass through lush tropical forest and a beautiful beach in Sabang, where the river meets the sea. Around the park area, you might spot long-tailed macaques, large monitor lizards and other wildlife roaming freely. Overall, the experience is a mix of adventure, nature, and quiet awe - it's not just a cave tour but a full eco-tourism experience.