I went to UNSW for an open day as well as a biology excursion and HATED it. Honestly I don't care how good it is academically wise, I'd never go to a uni that is so bleak and lacking life.
Not to be racist by any means, but I would have been lucky if I saw 20 white people the whole day (even the ones that I did see looked like they'd spent their last year in an isolation cell, devoid from human contact). Everyone else was head in books, music in ears all walking around in their little social/cultural groups. Yes I'm exaggerating, but it did not look inviting nor social whatsoever. It also got scrapped off my list.
In an English excursion to Usyd I heard someone some guy say "omg, I've really excelled in physics this semester". Needless to say it was also off my list.
Tbh you only get to go to uni once as an 18 year old, may as well make the most of and pick somewhere you will actually enjoy (if this is UNSW then go for it). Personally, I'm going either UTS or MQU... or UON if I bomb my HSC lol, and then I'll transfer, because that was pretty sub-standard too, bearable however.