The cave complex at Chiang Dao is well worth the effort to get to it. Once there, you will not be dissappointed. The caves are expansive and impressive (take a flashlight). A small fee is required for the gas that fuels the light that is carried by your guide. Most of the guides are young Thai girls who do an excellent job of describing the cave formations and leading you through the complex. It is a good adventure and I'm sure a good time will be had by all (see note below). Note: If you are claustrophobic, arachnophobic, or just afraid of the dark you should probably choose another activity:) Good journeys!