Hi there, I can only speak from experience in terms of skiing, as I was skiing at altitudes of around 2800m and the thing I had to be careful about was my hypo awareness at this altitude, as i'd had a few hypos that I wasn't aware of so I did regular testing. I took jelly babies as they are handy to eat quickly and quick acting. I am guessing it will be fairly warm on the trail so just make sure what ever glucose you take is ok to carry and quick to act. Otherwise would love to come with you, that's certainly one place i'd love to go before I pop my clogs !