Kanchenjunga is the third highest peak in the world, where Kanchenjunga national park is a must place to explore. A biosphere filled amidst thick jungle which is a popular trekking spot too. Yes there are safaris available which needs to be booked online. These rides are available on restricted timing basis, so it’s better to pre plan. Lot of info regarding bookings are available online. There are lot of flora, fauna say more of cat species animals, and aviflora bird species. Will share a few tripoto links written by travellers pertaining to their travel to Kanchenjunga, see if it is suitable for your travel.