KUMAON trip suggestion?

(Pic: My village, near devidhura) Hi, I am studying in TISS, Mumbai and have got this 20 days winter vacation, starting on 16th dec . My house is in haldwani but because father was in Army so stayed less there and didn't explore much. I have been to Nanital and nearby famous place. Now, I want to explore Kuman - do some treks. Need suggestions ?