3 Solo Options. Opinions?

Hey!

So from the title, I am planning my first solo trip. I am 22 from the UK, and have a few options of dream destinations I am thinking of. I would like peoples opinions on each, and if they are good viable options. Budget is open pretty wide, hence included Aus etc.

First of which is Norway, specifically Tromso in the arctic circle, I have always had a thing of wanting to visit the north of Norway and see how its like etc.

The join first option is another favourite of mine, South Africa, specifically Cape Town. Moreso looking for the beach vibe, but also the private reserves etc that they have.

Third and final option is Australia, very long flight, however seems a beautiful country, just need to decide which city, or maybe do each one whilst I am there.

What is everyones opinions on each and any travel advice for a first time solo.