The opening of Skytrain, a people mover inside the airport, in Soekarno Hatta International Airport could be a new tourism ride. If you wanna move around the airport and have some sightseeing at the Airport, I suggest you take a skytrain.
You can see some aircraft from many airline companies
Or you can see the Airport tower
Well, a lot of things to see
Just do not forget the schedule of the Skytrain. It is a free ride train. And have fun