It is important not to use the left hand for eating as it is considered unclean. Public displays of affection e.g. kissing, hugging, and holding hands are most frowned upon. If you are invited to a Hindu house, do not enter the kitchen, as it may cause offence. Porters and bellboys will only expect around five to ten Rupees per bag. On the social front Indians on the whole are not formal people, so don't be too concerned about appearance.
Business dress is the same as most other places in the world consisting of suits and ties.
Indian custom encourages modesty in clothing especially for women, cover legs and arms where ever possible. Both men and women should always remember to remove shoes when entering temples or mosques. Local Customs Indian's take sport very seriously and especially relish cricket victories against the likes of England. Delhi has a surprising amount of sporting facilities for the active traveller including cricket pitches and a beautiful golf course at the Delhi Golf Club.