I would say you go at Nainital trip. In nainital you can explore various places in and around nainital. You can check it for reference: https://travelist.co.in/best-tourist-places-in-nainital/
Kasol Trip. kasol has serene beauty all around. You will find cute small cafes to eat and chill with your dear ones. I would suggest you to visit Kasol with your friends.
Definitely hike upto Kheerganga. You will find absolutely gorgeous blue skies and pine trees. Keep traveling.