You travel with the hope that something unexpected will happen. It has to do with enjoying being lost and figuring it out and the satisfaction. I always get a little disappointed when I know too well where I'm going or when I've lived in a place so long that there's no chance I could possibly get lost.
If you talk to geneticists they are constantly finding that your genes are being switched on and off because of the environment. Genes alone do not determine an exact path in your life.