I think it depends on whether the slideshow is about your personal adventure and impressions, or more documentary about the places. If the former, you can include some "I was there" shots of yourself, but I find the closeups of you distract from the scenery. You are more in proportion with the scene, in the one walking up the path, but I'm not crazy about the bright patch in the sky. For shots of someone in a landscape, I guess I prefer them to be a little farther from the camera, a little more "in" the scene.
For me the last one best conveys the sense of the wide space & landscape.
Sounds like an awesome trip.
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