Phong Nha-Ke Bang
Flora and fauna
Airplane: Currently, the closest service is via Vietnam Airlines to Dong Hoi, check their website for latest fares and flight times.
Train: Several arrivals and departures at Dong Hoi daily from as far away as Hanoi and Ho Chi Minh City, only a few hours from Hue.
Bus: A local bus goes from Dong Hoi to Phong Nha for 40,000 VND. It departs at 14:00 from Nam Ly bus station. The bus back to Dong Hoi leaves Phong Nha at 8:00, so you have to either stay overnight or try to go back with one of the tour buses (they may even take you to Dong Hoi for free).
Motorbikes: Motorbikes can be rented for about 150,000 for one way or as low as 200,000 for return. At your own risk. About 1 hour on a highway with cars, oxcarts, motorbikes, buses, trucks.
Taxis: can be hired from hotels/resorts, airport or train station in Dong Hoi. About 1 hour on a highway with cars, oxcarts, motorbikes, buses, trucks.
Tours are available from Hue.
Hotels in Dong Hoi can arrange day trips to the park.
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.
There are several guest houses around.