Hey Ali, Depending on your current location you may choose following options : 1)Delhi -Jaipur, Auli, Rishikesh, Mussourie, Parvati valley,Kullu-Manali, Kedarkantha trek 2)Mumbai -Goa, Wayanand, Allepay, Banglore, Coorg, Munnar, Kumarakom 3)Calcutta — Gangtok, Darjeeling,North Sikkim, Shillong Acc. to my experience i would suggest choose any if these : 1)Jaiselmar
2)Goa
3)Rann of Kutch
4)Kedarkantha trek Hope this would help you.
If you want to make a plan for Kasol Manali, then book your flight/train to Delhi..then you have to take bus from Kashmiri Gate ( Delhi) to Bhuntar.. after reaching Bhuntar take local bus to Kasol. will take 1.30 hrs..cost 60-80 RS..
you can book your hotel/hostel by using Make my trip or Oyo rooms..
If you like beaches than obviously Goa, Ganpati pule, kashid beach near alibagh, Diu in Gujarat. if you're fond of enjoying snow and cold than choose from Northern India or north east.