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If it's a mixture of things, I'd probably just stick with the zoom. I'm not too familiar with the NEX series so I can't comment on low-light/ISO performance and whether your particular model has a built-in flash. With that said, the variable aperture on your zoom lens will reduce your ability to take lower-light photographs (with/without flash if you have it) but it won't remove your ability to do so.
Play around with the kit lens here before you leave. If there's a focal length that you find that you're using, then use that to determine what your next lens should be.
To answer your question- yes wider is generally better when taking pictures of grand vistas or other types of landscapes. That said, it's not the best when taking pictures of people (close up, due to the distortion it produces). This is why I say stick with your zoom lens since it has the focal lengths you need for your vacation based on the info given.
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