Do’s and dont’s in Chennai

Do not drink water in any of the restaurants. Carry a bottle of mineral water with you wherever you travel. Although this is expensive, it will spare you of the much fatter medical bills. I used mineral water to even brush my teeth. You know how bad it is.
Do not eat at any roadside place: Although they look tempting, the salads and fruits sold on the roadside, except maybe bananas are all health hazards. STAY AWAY! I have eaten out almost everywhere in Mumbai in the shadiest of places but Chennai is a different ballgame altogether.
Do not opt for meters with auto-ricshaw drivers: Their meters are invariably tampered and it is best to fix a price before you venture out. Do not heed their incessant grumble on the way. These parasites know every trick in the book to break you down.
Do not talk to strangers who try to make conversation in Hindi: Most of them are locals trying to make a quick buck by pretending to be lost or duped passengers.
Do not venture too close to the sea in Marina: Not because it is dangerous to life but you will step on the morning refuse of some fisherman.
Do not sleep without a mosquito repellent at arms distance. There are enough and more diseases that you can land up with.
Do not touch your eyes without washing them first: You may land with conjunctivitis.
Do not drive without a license: If the Police come to know that you are not a local, you are fleeced double. A police officer had the gall to ask me why my license was in Hindi!
Do not sit next to a lady in a bus even if the seat next to her is empty even if the lady is as attractive as a pig after a mud-bath.

There will be many more to this list. These are ones that I could think of immediately.