The hop-on hop-off idea worked really well, with unlimited trips possible between Darling Harbour and Circular Quay, two important tourist centres, and great views of the Bridge (you go under it) and the Opera House. There is a tour-guide on the boat giving the history of what you're looking at.
You need a timetable as the boats are not that frequent and finish quite early. We really enjoyed the zoo (world-class), with the ride up and down in the cable car included. We didn't go on the fast boat out to Manly in the end, as we had too many other things to do back in the city, (and the sort of things on offer there we had already done elsewhere), so probably didn't get our money's worth from a 3-Day pass, but it was still helpful to have the option as a fallback.
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