A trip is not a story in itself, it’s just a series of events. Some of these events will be interesting (you made it up Kilimanjaro!) and some will not (you arrived back at the airport on time).
That said, what makes an event interesting depends on the story you want to tell. Arriving back to the airport on time could be interesting, but only if your story was about how everything ran late while you were in Tanzania.
So, as a writer, your first job is to decide on the particular story you want to tell, and the events which make up that story, and ensuring all of those events are interesting or useful to the reader.
To see the kinds of stories that get published, look at the bold line of introductory copy (known as ‘standfirsts’ in the trade) of articles in papers, magazines and websites. Try writing the standfirst for your own story, and then use it as your brief.
Some trips have a physical objective (like reaching the top of Kilimanjaro, crossing Costa Rica, or seeing a tiger) that gives your article direction and purpose. The reader (hopefully) sticks with you because they want to know if you’ll achieve your goal.
But many trips don’t have an obvious goal. They are more about discovering a place, unpicking its history or meeting its people. In this case, create a personal goal to give your reader a sense of where you’re taking them.
Sentences like “I wanted to discover…” or “I was keen to understand…” give readers an idea of what’s to come, instead of you simply plunging them into the unknown.