I spent a few days aimlessly wandering around Manila alone last year.
Market near chinatown
Jeepneys are left over military jeeps left by the US in WWII.They now serve as the most popular means of public transport.
The ghettos here are very very serious.
Every taxi driver without a doubt will try to steal or cheat you in some way be on your guard.
If you find yourself in Manila definitely try to go to a chicken fight.