My 12 year old daughter and I went diving on GBR day on our
ABD last December. I'm PADI certified, but she is not, so we went on the introductory dive. It is about an hour long. Below are the prices from the Quicksilver website:
Introductory Diving- $172
Certified Diving 1 Dive - $124
Certified Diving 2 Dives - $174
I agree with the others that you will arrange it right on the boat and need to do so directly when you get onboard. We were there on Christmas day and the boat was completely full. Luckily, Disney worked its magic and got us on first, which made it a little less mayhem, but still crowded!
My daughter really, really, really wanted to see "Nemo" and our dive master brought us right to him so this was definitely the highlight of the trip for us. A couple of notes:
- I would not attempt to do both the helicopter ride and the SCUBA. We unfortunately tried to do this, and while both were fantastic, it made the day more hectic than it needed to be. Quicksilver says that they do this all the time and it would all work out. However, with a sold out boat, the scheduling was not where it should be. We ended up getting back from the helicopter late as they were calling our name "last call" over the PA system. My daughter and I raced to the diving, justifiably irritating the dive master and others on our trip. Because of this, we ended up not getting lunch (worth it!).
- Some more advanced divers on our ABD did the certified diving and they also said it was incredible. One of the parties brought their PADI cards, and one gentleman forgot his and they were able to look it up.
- This will be the only opportunity to dive the GBR unless you go back to Port Douglas/Cairns/somewhere else after the ABD. There's just not enough time, and even if you skipped a Disney day (don't!), it's still quite far to get to the outer reef and work out your wait times between diving and flying.
- You could potentially stay after your ABD on the Gold Coast and go diving from there. It's not the GBR, and we didn't do it so I can't comment on it, but there seemed to be quite a few offerings. There is a shop across the street to the left from the Sheraton Gold Coast that rents surfboards, etc. and has tours. They are extremely nice and helpful and I will update if I can remember the name.
Let me know if you have questions. Oh do I wish I were going back!