Then I'd say that the stay is just too short! But really, if you only have one day in Singapore, what should you be doing? Well, it really depends on what you're after. But if you're a compulsive shopper, then you're in for a treat. You might want to consider planting yourself in the heart of all the shopping malls - Orchard Road.
Let's use the MRT stations as a movement guide.
At Orchard MRT train station, you can pop by Shaw House where you can shop at Isetan. You can even catch a movie on the fly. But if you're only visiting for a day, I guess we'll have to skip the movies and continue thronging the malls. Around this shopping mall are Tangs, Wisma Atria and Wheelock Place.
Taking a train to the next MRT station at Somerset MRT Station. Shopping malls that you should visit include Orchard Cineleisure, Centrepoint and Heeren.
Next stop, Dhoby Ghaut MRT Station. There is only one big mall here - Plaza Singapura.
Finally, City Hall MRT Station. Right above the MRT station is Raffles City Shopping Mall and if you really can't get enough, talk a stroll towards Marina Square and Suntec City.
If you managed to visit all the malls in a day, congratulations! You're not a compulsive shopper. If you really are, it would take you two weeks to complete the entire shopping trip. Make sure you've asked your credit card company to up your limit, ok?