I think everyone has a unique taste of travel. so know your own where you want to go and spend there aa many days you want. either goa for beaches, Himachal for mountains, Rajasthan for Heritage or anywhere you want just listen to heart
U know India is very diverse country in terms weather and culture as well.. So places to be explored depends upon season during which you prefer to travel or to go on a trip..
In Summer - North India is unbeatable destination if u looking for relief from scorching heat.. It includes Shimla, Manali, Nainital, Musoorie, Kasol etc
In Winter - South india is preferred but u can also travel north or Sikkim (in East) if you want to witness snow...
Mumbai and Bangalore can be traveled through out the year...
Last one is Goa specially on occasion of new year..