Luang Pha Waing Cave (http://northernthailand.c...) - is one of Northern Thailand's largest caves and by far one of the most interesting.It is a large cave that is located about 45km from Lamphun near " it is only accessible with a 15 minute walk up hill to the top of the hill in order to enter the cave. You should also carry a bottle of water.
It is well worth the effort to get there.
