I did most of my backpacking in the backwoods of the US, so I'm not sure how much civilization you anticipate.

Battery life is going to be an issue, it's just a matter of how often. A single battery might not even last through the flights there and back. Unfortunately, batteries are heavy. (Also, though you probably know, make sure you have the electrical outlet adapters that you need.)

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I've been working with my Mac machine at my job for almost a year and I almost don't notice how frustrating it is to use anymore.

I absolutely grant that a significant portion of my frustration is due to "old dog / new tricks" issues.

There's really no reason that the ctrl-key should be in the corner of the keyboard (like Windows has), but my constant forgetting to use copy/paste with the cmnd key (which,on a Mac, is next to the space bar where the Alt key should be) is just annoying.

There's a ton of little things like this in switching from a Windows to a Mac OS machine. If you're not familiar with Mac OS, I'd think that using a Mac for the first time while on a vacation is just adding extra, unnecessary stress.