Passports valid for 3 months from date of entry are required of all visitors. All visitors require a Indian visa except for citizens of some commonwealth countries. Airport visas are available although this may result in delays upon arrival. It is advisable to obtain visa's in advance from Indian Embassies and High Commissions as some airlines may require it before allowing you to board. Visa requirements vary from time to time and you are advised to check on prevailing status well ahead of travel.
So long as your India visa remains valid you can visit If you're going to do this you need to plan ahead because some embassies only accept visa applications in the mornings, others only on certain days of the week. Some may take 24 hrs to issue, others 48 hrs. Some visas may have to be reffered to the country's capital city but this is rare.
Personal effects, film and cameras may be imported temporarily free of duty. However a customs bond may be required in connection with professional video equipment, tape recorders, radios, musical instruments and souvenirs from other countries, to ensure goods can be re-exported. Firearms need a special permit, which must be obtained in advance. Airport departure tax is payable by the client in foreign currency only. Excess baggage is strictly monitored and charges are very expensive. Customs officials normally inspect baggage on arrival and departure.