If you are a golfer then check out a few of the courses
walk around clarke quay during the evenings as well as bar hop in that area.
There are some cool prohibition style bars check those out as well. This is one of them -
28HKS they only accept reservations, no walk ins.
go to the top of marina bay sands for the view and check out Ku De Ta while up there. I personally didnt like it that much but worth going early for the view and a few drinks
Check out a restuarant called Les Amis, there are a bunch of other restaurants on the same street all owned by the same company and call good. I think the japanese one beside it is called Aoki or something (expect to drop a few hundred Sing) there is also a rustic italian that is on the same street too.
clubs - Zouk, Fenix, Mink
Go to Brix at the Grand Hyatt