Mate i went there early one morning and fished just outside the maritime museum and a security guard came and said that i can fish over the other side of darling harbour and up around the sydney wharf apartments(i hooked up to a solid 35 cm+ bream but i lost it right beside the boardwalk, on a zman grub), i would say just straight away go outside the maritime museum next to the submarine (big bream hang around and they are fat because everyone feeds them),until you get kicked out and just be polite and move along to the board walk up around the sydney wharf apartments, look on the inside edge of the boardwalk, fairly shallow and if you see one cast away from it and try not to spook it (there are usually some just sitting under the boardwalk) hope this helps