first of all I envy you, you are going to the best city in the world 👽❤️
I would go to different neighbourhoods and lose myself: San Telmo, Recoleta, Palermo, Boedo, La Boca. all of them have something to see.
I would make sure to eat a good asado, fracturas for breakfast and probably some pasta con estofado in some random bodegon of the city!
If you like to party make sure to experie the nighlife: bars and clubs are the best vibe in the world- I would try to make some local friends as Buenos Aires have the best friends and party people I have ever met.
I think you can pay public transport with your credit card now btw!
And last, bring money as things now are kind of expensive.
Hope this helps! Let me know if you want more tips and have an amazing trip
