From Peggy some things she posted and I thought I would refresh everyones memory - great information.
Pat and Ray -- Kelly Tarlton's has a free van to transport you to their facility. It stops at the Sky City Hotel once an hour during the day (it's either on the hour or the half hour--can't remember for sure).
The other neat "free" transportation option in Auckland are the Circle City buses--you can ride completely around the downtown area in them. They're great if you want to go down to the harbor or shopping--or to a downtown restaurant. You can catch the Circle bus just across the street from the Sky City Tower/Hotel. They run every 15 minutes or so. Besides Kelly Tarlton's, the other thing we really enjoyed in Auckland was the Maritime Museum which is right on the harbor. If you're into that sort of thing--it's one of the best we've seen. We also enjoyed taking the ferry over to Devonshire--a really neat little island--lots of shops and an old Fort. You catch the ferry in the harbor area also--if you go, buy the combination ferry/tour ticket to get a complete tour of the island.