jeklah, lots of things to do.

First, let's keep the limits on your walking in mind.

There's a tour bus (Hippo) that makes a circuit around Singapore (and I think this is the one that's run by the Flyer people). It's a double deck where the top is cut off the top; should be one of these hop on hop off types of things. So if you want to be driven around, that's one option. If you are arriving in Singapore on SIA, they have their own version called the Hop On - looks like an old trolley. Just have your boarding pass handy.

BKKROP is indeed talking about the Marriott Hotel. It's on the corner of Scotts and Orchard Road. Directly across from the Marriott is the brand new ION Orchard shopping mall - as far as shopping is concerned the entire length of Orchard Road is wall to wall shopping centers. On the other hand not sure which coffeeshop BKKROP is referring to. I will say that there's an open air McDonalds on Scotts Road across from the Marriott where you can see the world go by. However, if you want the local coffee experience, try any of the following: Killiney Kopitiam, Ya Kun (pronounced Ya Koon) or Toast Box. Singapore style coffee is roasted until it's slightly burnt - maybe you'll like it, maybe you won't but it's local color. Last thought: you might want to try foot reflexology (ie foot massage). Note, it's based on shiatsu pressure point techniques so you might find it painful.

Other stuff - Lonely Planet or Fodors will help, but these are the things that come to mind. BTW be aware that the climate here can be like a blast furnace especially if you are coming from someplace temperate. You may want to be inside a shopping center at 2PM.