OK, so the next thing I'm trying to figure out are phones. In my current plan I can add an intl. package which allows me to call to AU but I can't call back to the US unless I have access to wifi. Someone suggested possibly buying a burner here and then activating it there? I'm hoping to have access to google maps and ideally have a hotspot. Any suggestions that have worked well for you?
You can have a local copy of a section of google maps... just download the sections (Google allows you to do large spaces) before hand if it's a concern.
No need for a burner phone at all, just swap sim over if you want data. Boost mobile does good data plans, which is an MVNO that runs on the biggest Australian network's hardware (in other words, good reception at a better cost)