Trang An memorable boat trip

A memorable boat trip - slowly mandearing in between limestone hill. The place was so green that even the water is emerald green (maybe from the seaweed grew underneath) Visited underground caves and ancient temples. Buy ticket at the complex across the waterways and walk underground to the docking boats. 3 trail routes to choose from and best time to visit - early morning or late afternoon when it is not too hot as the whole trip takes 2.5 to 3 hour.