Caving at Hang EnHaving heard about Oxalis Adventure Tours via a DJI drone product launch televised by Good Morning America, I just knew that this was worth seeking out. The costs are very budget-friendly considering what you get in return. The experiences are rich, there might be leeches, there are definitely cold swimming pools, warm swimming pools with fish that eat the dead skin off of your feet, unless you're wearing flip flops - the tiny guys seemed to be scared of my flip flops anyway - not sure why! The company provides fresh, fun and delicious food. You get lots of attention, rice wine, and ample kindness. The adventures are physically challenging - I'm not a fitness guru, but I'm also not totally out to pasture, and I found much of the trekking to be a great workout! I probably lost 10 pounds, but gained 10 friends!