My personal idea is:
Look at the map and choose a destination after your personal decision.
It all depends on your age,hobbies,likes,dislikes,recommended places, available festivals,way of travelling,season, parents or friends there and your free time which will shape your decision.Generally you make some changes while on the road according to the people you meet,situation,economy,etc.
After 45.s:
Look at the map, check places you havent been to,have a

or raki at this step,dream it,make it a target,be there to discover,meet new friends,cheers every evening and capture a different piece and colour of the world each time..
That's my experience from life and spirit of adventure travelling now.
Cheers