Certainly not within continental US, but the RCC in HKG is very nice with showers and hot foods! While I am not sure how good the lounges are in ST, there are plenty of very nice *A lounges worldwide.
LAX
If you're in HKG and have your choice of *A lounge access the RCC would be at the bottom of my list. If it is the only one, OK, but if you can choose between TG, SQ and UA I would do them in that order, with quite a gap between the last two.