No Doubt Lonavala is a great Place. But i would suggest it strictly in monsoon .Visited Lonavala on Dec 29th 2019 and was greatly disappointed for the Dried Hills. So i would suggest that in Monsoon.
I would recommend Delhi. If you want the real taste of North India, Delhi is the place to be. Hauz Khas, the architectural marvels in Delhi, Chandni Chowk, and others.
In south
Pondicherry,Coonor,Mysore,Otty,Kodaikanal,Hampi, Coorg
In west
Lonavla, Goa In north
Jaipur, Himachal Pradesh, Agra, Chandigarh
In east
Assam, Meghalaya