Arrival at New jalpaiguri railway station:
NJP station connects all the hill station in that area.
you can go to Gangtok, darjeeling, pelling. Local cab are available from NJP to prime locations on sharing basis. it will cost you following:
NJP to Darjeeling : 250 rs
NJP to gangtok. : 350 rs
also i would suggest you to travel via toy train if you are traveling to Darjeeling.( but travel time is around 8 hr keep this in mind)
check in to hotel get rest and also you can roam in local market but remember local market closes around 8 pm , so plan accordingly.
1. if you are going to gangtok first book hotel near to mg road market. this market is well structured and you can have pleasant evening hear
2. and if you are travelling to Darjeeling first i would suggest you to book hotel little bit far from the mall road ( not more than 1 km) as the market is crowded.
also choose hotel on the valley side, mount kanchanjangha is that side so you can have the view.