Going to be in Dong Hoi late July. Coming from Danang by train. Does anyone know the best way to see Paradise cave, we are thinking of hiring bikes then getting ticket at entrance. Can you get a tour guide at caves? and if so about how much? Also can you hire a guide with car from Dong Hoi to go to the Vihn Moc Tunnels. Have done the tunnels from Hue before but am traveling with another couple who wants to go. Thanks in advance for any help.