Where in the world are the MacArenas? Part III

To see you know who and to enjoy some much needed R & R, we’re going from

33°52'8.11"S151°12'25.43"E

19°15'27.46"S 146°49'4.43"E

Then

16°55'24.78"S 145°46'25.34"E

Where are we leaving from?
What is our first destination?
What is our second destination
Why are we going?

Destination clues not only abound here:
Aon / Eins	Dó / Zwei	Tri / Drei	Ceathair / Vier
Howzat

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