Sometimes I find myself asking that same question in this city...
Here are some top clubs in the city. I'm sure if you ask the taxi driver, he'll know where it is. Quantum Club, Alpha Club, Barasti and 360. Personally I don't go to them a lot cause the music is to House for my taste except for Barasti. Every hotel has a bar, or should in Dubai. If you're looking for a fun pub to just chill, head to "The Irish Village". You'll have a blast, it's always fun.
If you're looking for shopping, I guess "Dubai Mall" and "Festival City" is worth the look. "Mall of the Emirates" has that snow thing which I'm sure you've heard about. Anything else, ask away. Have fun matey.