From Kolkata Darjeeling would be a grt place visit. it has nature, adventure and many more.. A ride in the toy train should be the first in your to do list..the views and the local life is so well understood through this journey.. you have a couple of monasteries too . and the Zoo is a good option if you have kids.. and documentary movies on mountaineering inside the zoo campus is also worth it. don't miss to wear their traditional costumes and get a pic. River rafting would be a grt adventurous activity to cherish.