The biking distance from Dong Hoi to Phong Nha is short but many single tracks through young forests and smooth country roads along mountainous areas are unique and particular scenery. We can leave the hotel a little bit late. In the morning, we explore the fishing villages of locals on paths along the ocean and some of the jungle near the mountain range. We ride on hilly back roads through rubber plantations and ride paddy of west Ho Chi Minh trails before we reach to the river. Then we enjoy mountain views and ride on footpaths along the river to Phong Nha. In the afternnoon, travel to Paradise Cave by bus, spend an hour and a half exploring this cave, then return to Phong Nha, enjoy dinner in town.