Once in Phong Nha Park, head to Paradise Cave. First opened to the public in 2010, this is one of the larger and most impressive accessible caves in the area. After you climb over 400 stairs, you arrive at the large entrance of this cave. Descend into the cave on a wooden walkway, made to protect and preserve the fragile cave formations. This walkway continues for almost one mile through the enormous, well lighted cave.