Phong Nha-Ke Bang
Flora and fauna
Tien son caves: It is 50,000 dong to see both caves and 200,000(11$) to rent a boat for up to 10 people or 240,000 for 14 people. You can share a boat with other tourist that show up. Boat is needed. Caves are exquisist.
Nuoc Mooc spring: 50,000 for ticket. Transportation can be negotiated to take you there from Phong Nha village.
motobikes can be rented to take you to Dong Hoi for about 150,000, taxis are more expensive.