My friend and I (two Americans in our early 30s) took the Intro to Caving class, and it was great. Our group was only three travelers and two guides, Ooan and Bo. Ooan and Bo were very professional and overall very nice guys with a lot of patience. The three of us felt very safe knowing that we were in good hands with the guides and the equipment. What a cool thing to do while in Chiang Mai! The cave was amazing! There a few climbs/repels/walks at the beginning of the cave before the big drop into the main part, which was quite a ways down! (You need to save your energy for the way back up!) Once in the main part of the cave, we ate lunch and took our time exploring the different formations – our adventurous buddy from Germany took a walk with one of the guides through some water to a different part of the cave where she saw millipedes and interesting spiders. Learning and using the equipment was a lot of fun. Be prepared to get a massage afterwards!