Be prepared to do a significant amount of development work. Selling trips isn't anything like selling printer ink and other impulse buys.
So forget about minisites and articles rewritten based on three other people's articles. The serious travelers landing on your site will back right out of this crap content. Travel affiliates have enough working against them as it is. It's so easy for the affiliate to become disconnected from the referral in the days, weeks and even months they consider the trip.