Sussed it out today, y'all. Carlton Gardens look miiiiint. Here's how to get there from
Melbourne Central Station.
So, take the exit onto
Swanston Street. This is the one that goes to the State Library (you go up the escalators and then left past the big clock thingo). Cross the road toward the State Library; your view should be something like this.
That's the State Library on the right. If you turn your head 90 degrees to the left, you should see the big green slimy roof of RMIT. Walk straight up
La Trobe Street - so, directly away from Melbourne Central Station.
If you keep walking, you should see this:
That's
Mr. Tulk on the right (a café attached to the State Library). It might be closed on the day (public holiday and all). Just continue walking up La Trobe Street.
You should soon see this building. That one on the right in the image above is the building our Tutorial Centre is in, coincidentally. Keep walking past it - still on La Trobe Street.
Basically, this is at the end of La Trobe Street - you'll be able to see Carlton Gardens for sure. Just walk toward the grass lol. And then you'll be met with something along the lines of this:
Aaaaaaand we're laughin'!