Hello Kajal,
Following are some places you can visit in Shillong:
1) Umiam lake (You can the article I've written on it)
2) Elephant falls
3) Shillong peak
4) Don bosco Muesum
5) Spread Eagle falls, etc.
Hope this helps. Don't forget to share your experience with us here on Tripoto.We'd to read about it.
Safe travels! :)
Some of the places you must visit in Shillong are -
Lady Hydari park
Wards Lake
The Golf Link
The Shillong Cathedral
The Don Bosco Museum
You can also plan to visit these good places near Shillong-
CherraPunjee
Mawsynram, the wettest place on earth
Elephant Falls
BaraPani, Umiam Lake
Hey Kajal,
There is a Government tourism office near the bus stand of Shillong. From there daily buses go to all points in Meghalaya (drop you back at Shillong in the evening). It will take 4-6 days to cover almost all Meghalaya. You just book tickets to Guwahati; from there take a sharing jeep to Shillong and stay in a hotel near the bus stand or Police bazaar of Shillong. I visited there in April 2018 so you can ask any query related to above.
Happy travelling!!!!!