As nouns the difference between wandering and vagation
is that
wandering is travelling with no preset route; roaming while
vagation is the act of wandering, straying, or departing from the expected or regular course; an instance or occasion of this; a wandering; a rambling; a roaming; an aberration.
As an adjective wandering
is which wanders; travelling from place to place.
As a verb wandering
is present participle of lang=en.