Great value.

Must dos in Sydney. People I dragged in with me didn't want to leave any of the sights in the end! The experiences took longer than I thought they would.

The Aquarium should have put up a notice outside the entrance to inform the public they will close early during winter, at 4:30pm.

Aquarium - One word Awesome! Bring comfortable shoes. Make sure you take a couple minutes at the end to sit in front of the gigantic glass wall to relax. I had the best time here so my rating is quite high!

Wildlife World - A great way to make sure you see all of Australia's strange and wonderful creatures! I spent a lot of time here.

Sydney Tower and Oz Trek - Not really all that amazing. You get a horrible view of the Opera House so don't have high expectations. I don't think I would have felt like I missed anything if I didn't go up. Oz Trek was kinda cool but aimed more for children.

Sydney Harbour Cruise - Fun if you haven't already used the ferry 20 times. Useful information on the hop on hop off tour. A great way to get around.

Darling Harbour - Don't take the "People-Mover Train" it is a waste of money! All you do is watch people waking the same pace as you! Overall I think I would have been fine with just Wildlife World and the Aquarium.

Very useful ticket. You pick up tickets for all four things from one place - we did it in the Aquarium as it was most central and is open till 10pm. The combined pass you can buy on entry to the wildlife world and aquarium is actually quite pricey, and the cruises don't work out that cheap anyway. You can choose from a variety of cruises, but we just did the one hour and 15 minute highlights cruise, which was nice and relaxing. We didn't even use the tower ticket as we already had dinner in the tower restaurant booked, but I still thought this pass was good value for money and was good for queue jumping.