Well he was there a month and of course did the normal touristy places like the Sydney Opera House, he did the Sydney Harbor bridge climb, hung out on Bondi Beach. He went to Australia Zoo.
He really enjoyed the outdoorsy stuff he did the most though. Scuba diving on the Great barrier Reef, touring the Margaret River caves, went 4 wheeling on Fraser Island, and went to see the 12 Apostles.
He actually said there are two things he wanted to do but ended up not doing which were going to Uluru-Kata Tjuta National Park and doing an outback camping tour. Those are for his next trip down under apparently.
A couple of those things are on my list in addition to a few other things as well.