I'm travelling to Australia soon to receive a medical procedure from a gastroenterologist who provides a treatment not available in the US (which I intend to pay for out of pocket). I'm also visiting as a tourist and plan to go to beaches and restaurants and just kind of enjoy my time in a completely new place. Is the medical treatment visa required for this or will an ETA suffice?
I've never traveled outside of North America, and never to a country that requires a visa. I'm unsure whether the purpose of the visa is purely to grant entry or if it governs the things that I can and cannot do while in the country (beyond working, which I'm pretty sure I can't do on an ETA). I'd hate to arrive and be denied entry if it turns out I have the wrong kind of entry permission. The homeaffairs.gov.au website isn't particularly clear for my situation.