HOW TO GET THERE?
The state has its airport in Dimapur, which is regularly serviced by major airlines (Indigo & Air India). The city is linked to Kolkata by air. Tourists then have to travel to Kohima by road after reaching Dimapur. It takes 2 and a half hours to reach Dimapur by road.
A good road network covers the state. The state capital Kohima is linked to Shillong and Guwahati, which are important cities in North Eastern India. First proceed to Dimapur and then travel to Kohima.
The major railway station in the state is Dimapur, which is linked to Guwahati. Guwahati is in turn connected to the rest of the country by important trains.
Nagaland has a largely monsoon climate with high humidity levels. Annual rainfall averages around 70–100 inches (1,800–2,500 mm), concentrated in the months of May to September. Temperatures range from 70 °F (21 °C) to 104 °F (40 °C). In winter, temperatures do not generally drop below 39 °F (4 °C), but frost is common at high elevations. The state enjoys a salubrious climate. Summer is the shortest season in the state that lasts for only a few months. The temperature during the summer season remains between 16 °C (61 °F) to 31 °C (88 °F). Winter makes an early arrival and bitter cold and dry weather strikes certain regions of the state. The maximum average temperature recorded in the winter season is 24 °C (75 °F). Strong northwest winds blow across the state during the months of February and March.
Inner Line Permit (ILP)
The Inner Line Permit is an official travel document issued by the Government of Nagaland to allow inward travel of Indian citizens of other states into a protected/restricted area for a limited period. It is obligatory for every Indian citizens other than Nagaland to obtain permit for entering into the protected state of Nagaland. This undertaking is an effort by the Government of Nagaland to regulate the prevailing issue of Illegal immigration and to generate vital statistics for Tourism and other inter-state businesses. The Inner Line Permit segregates the tourists and Govt. official of other states from the other categories to promote tourism and development. Hence a separate Inner Line Permit (ILP) is issued. The Inner Line Permit (ILP) Regulation Act (Section III of the Bengal Eastern Frontier Regulation Act of 1873) is in operation in the Naga Hill district (Present Nagaland state) since 1873. It has been promulgated to safeguard the identity and the very existence of the indigenous people of Nagaland from exploitation by outsiders.
Inner Line Permits can be obtained from the Resident Commissioner’s office of Nagaland House in New Delhi and Kolkata and all district administration offices in the state of Nagaland.
Alder Tours and Travels also offers Inner Line Permit services for travellers. Tourist and visitors can apply online and the processing is taken care by Alder Tours and Travels. Most of the time it gets done in a day however can go to the extend of 24-72 working hours.
The link is shown here : http://www.aldertoursntravels.com/aldertours/forms/20130710-770d/form.php
Restricted Area Permit (RAP) / Protected Area Permit (PAP)
Foreign Tourist are no longer required to obtain any permit before visiting Nagaland. This was done to promote tourism to the North East and permit requirements were relaxed for foreigners. However citizens of Afghanistan, China and Pakistan and foreign nationals of Pakistani origin, are required to obtain a special permit with the prior approval of the Ministry of Home Affairs.
For more detail information about RAP/PAP you may check the Ministry of Home Affairs FAQ.