<p>I traveled to several countries during the summers of my high school years. Where do I add that to my UC application? There doesn't seem to be a definite space for it.</p>
<p>If you attended some sort of workshop or course, or worked as an au pair or something else, then it would be another extra-curricular activity. If not, you could write about the influence of travel on your goals,etc, via the “additional comments.” Good luck.</p>