You can go clubbing until about 3am at one of the pubs/clubs around Wollongong in the CBD.
If you want to be a tourist you can go and hang around the top of the mountain and take photos or go down to Kiama and look at the "exciting" blowhole.
If you have a car you can go cruising around South Beach and watching all the filthy ethnics fight, chase each other, show off their "fully sick" cars and speak in a very vulgar version of English. If you're lucky enough, you too might be chased for looking at them in the wrong way or if you're being a tourist - simply by taking a photo of them or of something in their vicinity.
If you're into drugs you might be able to find one of our famous drug dens and sample the finest Marijuana from Jamberoo. If you're really pressed take a trip to Bellambi or Port Kembla where you can get fixed up with some of the stronger drugs. If you're in the mood for some sensual, toothless, Aboriginal, yeastie action then head on over to Wentworth St. Port Kembla where you can experience all the finest Wollongong has to offer by way of interest-free sex.
That's about all there is to do in Wollongong.