I went clubbing

I just now arrived back to the hostel from a dance club in Bellavista.  I ran back, as the metro is closed, I don't know the bus routes, and I don't trust taxis.  I believe I passed a M->F tranny enroute (1 of 3 fitting words), possibly up to no good.
The party can go on for much longer, but I have stuff to do tomorrow, so I left when I decided to leave.  In Brazil it can go until 06:00 hours.
I still do not know how to approach and handle a girl on the dancefloor, nor keep my Central Nervous Sytem mellow.  That is frustrating.