The lounge with shower that I am talking about is landside in Terminal 2 or (IIRC more likely) Terminal 3 that has that paid lounge or paid shower facility. Last time I used the paid shower facility at the lounge facility there, I was already landside at Terminal 1 arrivals and changed terminals to shower up and change for a meeting. Premium Plaza lounge or something like that is what it's called and it has a price list on display when you approach the desk there.

SIN hotels are usually pretty good about allowing me early check-in too and now with the downturn in the economy it should be even easier than it has been at anytime since the SARS hysteria.