Why not j'aime voyage?
Wondering the same thing. Right before this one I had a "write what you hear" thing and that one was "j'aime voyagé"
As far as I know, voyager is the Infinitive form and means "to travel", when voyage means just "(I) travel"
I travel - "Je voyage"
I like to travel - "J'aime voyager"
Only the first verb changes which in this case is 'like' or 'aime'
Any following verbs will be infinitive
If 'voyager' was the first verb it would become 'voyage' eg. Je voyage (I travel)
J'adore voyager - means the same
j'adore means I love not I like, it's more enthusiastic