Originally Posted by
jpatokal
I'm not sure I'd agree with that. Sure, you aren't going to see the whole city in 6 hours, but that should still give you an easy 3 hours to poke around, say, Chinatown or Orchard Rd and have a nice meal somewhere. The MRT is cheap and easy to navigate (30-40 min to city), and using a taxi won't cost much more and will save another half an hour's worth of time for a round trip.
In case you forgot, OP flight supposed to arrive at 1am. MRT is not running around that time. Not much going on around Chinatown or Orchard Rd either. Some food court do open 24 hrs, but I much rather stay airside be it in SKL, transit hotel or anywhere in T3 during that period just like Guy Betsy suggested.