Documents

Everyone needs a passport and a visa to enter India. Tourist visas are issued for six months. You can travel freely in all areas except the so-called "restricted areas".

Visa extensions are sometimes granted for 15 days, but the process is really complicated. Special permits may be required with the visa to visit certain areas. For areas such as parts of Sikkim and the North east frontier states, and northeast of Himachal Pradesh near the Tibetan border, you should apply for a permit at least four weeks in advance at Indian embassies and consular offices abroad or foreigners' registration offices, immigration offices at main international airports in India.
Most countries have embassies as well as consulates in India. You should get in touch with them, if you need assistance in case of emergency (theft, imprisonment and hospitalization).It is advisable to take out an insurance policy for medical emergencies as well as theft before leaving home.

Health

Only visitors traveling from certain countries in Africa, South America, and Papua New Guinea require a valid vaccination certificate for yellow fever. However, visitors should get vaccinated against tetanus, typhoid, and hepatitis A and B. It is also advisable to start a course of anti Malaria Pills before leaving and to consult a doctor. Also don't forget to carry your basic first aid kit that must include your personal medications, few aspirins, pain killers etc.

Since Indian temperature is hot and humid, drink lots of water and other fluids to avoid dehydration. Green coconut water, fresh lime juice will keep you rejuvenated. Buy bottled water from respectable outlets. Be careful that you eat non vegetarian dishes only at good restaurants. Try to avoid eating fish when you are not in the coastal regions.

Don't forget to bring your sunscreen lotion and use it whenever you step out to protect your skin. Also carry dark sunglasses, wear cotton clothes. Also don't forget to bring your sunscreen lotion.

Behaviors

Try to avoid short skirts, halter neck tops, or anything which could attract the attention.

Eating with your fingers is the best way to enjoy Indian food. It is considered impolite to use your left hand for eating and sitting on the floor for eating is common.
The feet are considered like the lowliest part of our body, so usually you will take your shoes off before entering a house. On the other hand, the head is thought to be the person's spiritual center.
Public displays of affection between couples are mainly disapproved in India and can be punished with a fine in some places.

When you enter a place of worship, be sure that you are well dressed. At most places, you should take off your shoes, and sometimes cover your head. Anyway, you should behave according to the strict rules of the places.