I've been and loved it. I flew a courier trip (pos space for $300 for ferrying DHL package on a comm'l airline). I flew on JAL to NRT and then to SIN (I know this is not what you asked, but you could prob do the same on DL and then NW to SIN). I arrived in SIN at night (I think) and crashed until morning and then had two days. The food stalls are great, sort of food courts in the malls, which are fabulous, they were in the basement of the malls. I mainly shopped and hung out in SIN. Not much sightseeing.

I had a drink and shopped at the Raffles Hotel which is worth seeing for the history and bought some posters which I had framed and are fabulous. There is/was a Tiffany's in the Raffles Hotel.

I went to Thailand (Phuket) and Malaysia (KL and Langkawii) which were fabulous, on the same trip and then flew out of SIN. I was only gone a week, but it was great. The Cameroon (sp.) Highlands looked fabulous as well, and I don't think is too far from SIN. I took the train.

The flights inter Asia were dirt cheap and I was able to buy Biz class seats for about $50 each leg. Short hops to KL and Phuket. Phuket was trains, planes and automobiles and ferries, but it was beautiful. I stayed at the Detai in the rainforest.