Had Gone to the GHNP for a trek in 2005 , was a brilliant place and the way they have maintained it , It still is an amazing place for some good peaceful and non commercial hikes !! This is what the Park is about :

Great Himalayan National Park (GHNP) located in Kullu district of Himachal Pradesh is the latest addition to India’s National Parks. GHNP was created in 1984 . Starting from an altitude of 1,700 metres above mean sea level, the highest peak within the Park approaches almost 5,800 metres. The area of the National Park at the moment is 754.4 sq kms and it is naturally protected on the northern, eastern and southern boundaries by permanent snow or steep ridges. To facilitate conservation a 5 km wide buffer area, extending from the western periphery of the Park, has been classified as theEcodevelopment Project Area (EPA) or Ecozone. The EPA has an area of 326.6 sq km (including 61 sq kms of Tirthan wildlife sanctuary) with about 120 small villages, comprising 1600 households with a population of about 16,000. Since, the Indian Wildlife Protection Act 1972 does not permit any habitation in the National Park, an area of 90 sq. kms. in Sainj valley encompassing the two villages of Shakti and Marore has been classified as Sainj Wildlife Sanctuary (WLS). These two villages although technically "outside" the National Park, are physically located between two parts of GHNP. Thus the total area under the National Park administration is 1,171 sq km.