Grand Canyon Water Park Chiang Mai is quite unique. A massive swimming pool here was established in a former limestone quarry now filled with natural rainwater. So, the pool is surrounded by beautiful steep canyon walls and the water is deep enough for you to jump into. In addition to that, this outdoor water park also provides fun activities such as a gigantic inflatable obstacle course as well as some great facilities like a restaurant and a lake view cafe. What else do you need for a beautiful day?