Singapore Slings
Good plan Noisy, you can see the Hawker Hunter in many other places, but there is only one Singapore Sling.
Did you know that the MRT (Underground) can take you right there from Changi. It's a shuttle to Tanah Merah then the EW (EastWest) line to City Hall. A 5 minute walk through Raffles City and you are at the Long Bar.
For a bit of fresh air take a walk to the Singapore River and a Bum boat ride up and down the river. Of course Clark Quay may just beckon. Have fun