I was on my way to Mussoorie when we spent a night in Dehradun and decided to visit a few places before heading to Mussoorie. Robbers Cave or Guchchu Paani was the best attraction of that day. Though its better to visit this place in summers.
The first word that comes to mind is: Captivating. Its perfectly built and its picturesque. When you walk in the water flowing beneath you realise how peaceful it is.
A piece of advice: Do visit this place.