Ningaloo Reef - Exmouth, Western Australia.
A few million people and about 10 times this number may equal the count of Kangaroos jumping around. WA is my personal favorite, since there is endless space with almost no people. It's unbelievably empty. thousands of miles of white, sandy beaches ready to calm you down. Exmouth I liked the most. We spent 7 days snorkeling every day, watching the sun set to the west, a wonderful time that was.