Changi airport is one of the best airports in the world. There is so much to do at this place that you can easily spend 3-4 hours. For starters, everything from check-in, check out security check, baggage is easy. The staff are very coperative and always ready to help. It also has 4G speed wifi free for all tourists. Changi Airport also boasts of beautiful butterfly garden where you can spot different varieties of butterfly. There is also swimming pool which is chargeable at nominal rates.
There are lot of cafes, free leg massage chairs, sports section, movie zone and so much of entertainment for kids. Truly, a world class airport.