^ dio has it down.
Carry r20s or less. Most people don't have change for bigger bills, a lot of buses won't even break larger bills. Even at the market they have to ask a supervisor for change.
Watch out for trannies. Don't fight with guys with cauliflower ear unless you are a Black Belt in Jiujitsu.
Women are very open there, but yea watch out she might be taken.
Go do a drop-in at a Jiujitsu school and take some classes.
connectionrio.com