4 hrs at changi (4 jam di changi???!!)

Due to something i have to spent my time 4 straight hours in changi airport, WHAT SHOULD I DO?!!First i browse i find some nice place at my terminal (terminal 1) and decide want to visit the movie lounge and have some feet massage.Then when i arrive at Changi i just find out that all of the fun stuff are in TRANSIT AREA in level 3. To get there i have to do immigration check and have to show my