Ok, then in which case I'd say the film choices you outline form quite a good selection. The higher ISO will allow you to stop down even in daylight to keep your depth of field as high as one might like, and are still sensitive enough to hand hold in a pinch if the weather is gloomy. As Andy suggests above, perhaps throw in a few rolls of 400 speed B&W film, if that's your thing
I do like Ektar as a film, but as you have suggested, a tripod will be used perhaps less often than one might like with all the time in the world. No idea on your circumstances, but I may be tempted to take two 35mm bodies. Weather in these countries is notoriously changeable, and personally I'd not want to be stuck shooting landscapes with ISO100 film, handheld, in gloomy weather, on - for the sake of assumption - non-VR/IS/whatever lenses.
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If it were me going, I'd very likely take a single medium format camera with interchangeable backs - like the RB67 - and shoot on Ektar 100 / Velvia 50 in one back, and Portra 400 / Pro 400H in another back. Or depending on activities and circumstances, I'd take large format
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