Practical information about Wat Tham Chiang Dao
Entrance: 40 THB (to pay for the lighting of the cave)
Guide price for caves with no light: 200 THB
The guides are on site but you can also hire one to visit the whole Chiang Dao area by calling this number provided by TAT: 053 456 442 (I have not tested)
To go visit Wat Tham Chiang Dao, you can also book one of the tours above.