In or for, which one is right?

What do you like? What are you interested in? The word interested is an adjective in that sentence. And when interested as an adjective is followed by another noun, in this case the word travel, you should use the preposition in.

Sometimes though, you might hear an english speaker say: “I am interested to hear what you think about it.” In that case, interested is followed by a verb in the infinitive form.
So you can be interested in something, or interested to do something, but never for, on, about, or at.