Alright, I give up.
Where are the four places? The city, St Kilda, Richmond and Fitzroy? On the other hand, the lyrics specifically mention kissing while running along her street, which is, at very least, a feat requiring an impressive degree of coordination.
Or are they four points of the body? In which case, they are presumably not the head or the feet, since these are mentioned elsewhere in the song. So I’m thinking maybe a pair of nipples, a clit and a nicely rounded butt-cheek (or two – it’s only one butt, after all). Or maybe it’s just the fingers (and not the thumb) of her left hand. I really have no idea.
All that said, it’s probably just as well that we don’t know. If we did, Melbournian couples would no doubt have turned all four into places of pilgrimage by now.