Does anyone know how easy or how hard it is to get out of the airport in Singapore and do a city tour? (That's what I hope to do for the free evening I will have).
Has anyone done that?
It is very easy to do... there is a train / subway that goes from the airport into town. Singapore is a very safe place to walk and it is easy to catch taxi's around town too. There are some nice restaurants and you can also take a boat tour of the harbor, if you have time. Or if you just want a tour of the city, there is a transit tour into the city, although I don't remember if it runs at night or not.. you can just sign up for it at the airport. I haven't done the airport tour before, because it is so easy just to get in town on your own and get around.
If you don't decide to go into town, the airport is very nice also, with restaurants, places to get massages, and even a movie theatre... it is a great place if you are stuck with a lengthy layover. However, if you have the time, by all means go into the city.