Australia and Bali August Itinerary: How much time is too much time ?

Any and all suggestions / help are welcome. I've always wanted to go to Australia and New Zealand and I know the month of August isn't ideal (so unideal I wasn't even going to head to New Zealand...I'll be back!)

I love hiking, trekking, eating good food and animals :-). I've been obsessed with duck-billed platypusses since my dad brought back a hand puppet when he went to australia when I was a kid. With that being said, here is a rough itinerary that I have to confirm by tomorrow (the airfare is being held by Qantas right now).

SAT AUG 6th to NY to Cairns (arrive Monday the 8th midday)

Great Barrier Reef August 9th, 10th, 11th is this enough time?
Atherton Tableland August 12th platypus? :-)
Daintree Rainforest August 13th so close, seems like we should go?

Rent car one way, drive to Mackay for Platypus viewing 3 days? Should we have more time for this?
Stop at Whitsunday Islands along the way?
Mackay till Wednesday Aug 17th

WED AUG 17TH FLY TO DARWIN
3 1/2 days Kakadu National Park

AUG 21st fly to BALI
almost a week in Bali for relaxing, hiking high peaks there, cultural sites, maybe a homestay
6 days

AUG 27th to Uluru
Ayers Rock for 1 day-not interested in staying here for long from what I've read

AUG 29TH to Synday
4 1/2 days in Sydney and around the outskirts

FLY HOME SEPT 3rd

Just curious if anyone has any suggestions of what we should add, cutback on? Any treks we'd enjoy? Will we see enough animals in this time? Places we should go? I originally wanted to include Adelaide, but then my wife thought of Bali. I plan on going back for two weeks at some point during Australia's summer to do the Overland Track in Tasmania and go to Melbourne. All suggestions are welcome!!!!

Thought I should add, I like seeing animals, not eating them :-). Don't plan on decimating the platypus population. Plus, we love unique outdoors experiences and are getting dive certified so I figured we should try to get our monies worth. The Ghan also looked interesting to me, but too much $ and time I think? Thoughts? What are things we can't miss? Maybe cut a day or two from Sydney? Ok, I'm done now!

You are posting on the wrong branch of thorn tree--this branch is called "Australasia & Pacific - Pacific Islands & Papua New Guinea." You want the Australia/NZ branch.

Bali is part of South East Asia, not a Pacific Island.