The atmosphere early boring - before buses arrive - is calm and spiritual. Especially when the first light beam are coming thru the upper cave opening. The nuns taking care are very smiling and it's simple interesting watching them in the morning to clean the stair case and ground in front of huge Buddha statue. I return late afternoon and the light is creating with each new time a new atmosphere. Opening is 9 am to 5 pm and try to by either early or late to avoid the crowds.