Very subjective question but I'll bite. The most important thing to have in mind if this is something you want to write about on your applications to medical school is why you pursued the position and what you gained from it. If you're looking for exposure to patients, pursue an experience that maximizes patient contact, like volunteering in a hospital ER. If you want to see what it feels like to work with the truly underserved, then volunteer at a local foodbank. I would advise strongly against pursuing an opportunity simply because it is obscure. Perhaps this would make you stand out from a scribe to an admissions faculty somewhere, but the crucial aspect of that experience will again be the why and what was gained, as aforementioned.
That said, absolutely pursue a volunteering experience at the basecamp of Mt. Everest. Go on a missions trip Zanzibar. But you better have a ton more to say when asked about it than 'I painted a fencepost'.
