There's lots of stuff to do in Syd. Around the city you have Darling Harbour and of coz the Harbour Bridge/Circular Quay/Opera house. Excellent views from and across the Harbour Bridge as well. If you like day trips, you have to go to the Blue Mountains.
Crumpler is not necessarily cheaper due to the high AUD$ now, but you can check out the shop on George Street anyway. Enjoy!