The media tab is what makes your opportunity page visually rich. Remember that people are exploring and perhaps even nervous as they look through your opportunities. This is your opportunity to guide them, clarify things for them, and bring ease to any anxiousness.
We always recommend you at least add several photos to each trip. Photos are great to help people get an idea of the opportunity, what you do, what kind of people have done this before, a glance at the partner, and so much more.
Make this richer by adding a video. If you're not video savvy that's no problem. It's fairly simple to make nice slideshows these days even from your phone so perhaps you could create something simple. Either way, try and find a way to display images and video of your opportunities.
The last item you'll find on this page is the ability to pre-set a social media message. Here's how this works. When someone is looking at your event or a story shared from your event they will see an option to share that via social media. When they click the share button and the dialogue box pops up for Twitter or Facebook (examples) it will be pre-loaded with the default text you enter here. This is really helpful as you focus on using consistent hashtags.