Go to Shillong and Cherrapunjee and if you have time Mawlynnong. You have to fly into gauhati and hire a transport car to shillong. You can find then at the airport (you can go on shared basis or hire the whole car for 2k or 2.5k.
HI Surela, Attached below are few packages offered by Tripoto for hassle free travelling. Please take a look, fill the form and someone will get in touch with you. Thanks!