miklb is correct, the "thoughts on travel" is in a div with a class of description, so you could add this to your stylesheet (CSS):
Alternately, you could use font-weight: bold; instead.
The difference between doing this and actually adding bold tags to the theme is that doing it with CSS keeps the style and content separated, which is the best way to do things. That way, if you change something in your CSS, it takes effect on all your pages at once, keeping the look and feel of your site consistent. For anything involving "how stuff looks", you probably want to be editing the stylesheet.