1 Jaipur-Udaipur-Agra-Delhi if u want to see the historical architecture and other beautiful places like mahals etc
2 Kerala -( Munnar one of the most beautiful scene ) also u will feel close to nature
3 If u wanna go on some beach then Goa
4 Himachal Pradesh - snow and mountains
I won't recommend going to cities like Mumbai tho they may seem flashy and lively but tbh they aren't that wonderful compare to the natural and historical places, then again choice is urs.