>In coming June, i am going on family vacation to the high >altitude 'Ladakh' region of India & will be coming across >beautiful landscapes (moonscapes), meadows, one of the highest >motorable passes, Pangong Lake, High altitude desert in Nubra >Valley, rivers, glaciers etc.
Well then, to go with your D7100, I'd go with the Nikkor 16-85 f/3.5-5.6G ED VR...
Here again, as this is your first DSLR, before embarking, I'd still shoot images around your home to get the feel of how your new camera behaves.
Given the location, the images will be wonderful! Have fun!