Arguably the best spot in Circular Quay for sights...

Arguably the best spot in Circular Quay for sightseeing. Opera is basically right next to you and the harbour bridge is viewable from everywhere.

The place is pretty busy for the majority of the day so you may need to wait a while for a table, however, there is seating on the wall while you wait. Drink prices aren't the cheapest, but it's to be expected with the location. A must visit if you're even in Sydney though