It depends on what u Wud like to explore...
If u are a shopaholic prsn & like city life, Mumbai is ur destination
But if u are a nature lover & loves trekking,den go for Manali
If planning after monsoon then , kerala is good choice.
if in winter then manali or shimla
if at present then mumbai isnt a good choice if have enough courage then u cna also plan a foreign trip check thailand or bali both are safe and can be done with less expense. check my write up on all these places in my profile.