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My answer for all these what to take questions remains constant, does not matter if it's Ireland, México or Cape Cod, for FX 17-35mm 50mm 70-300VR add a Canon 500D close up lens.
Amen, I always have to chuckle when I see one of these "what should I bring" questions. Your shooting style is your shooting style, you should let it dictate your choice of lenses. Otherwise it is the tail wagging the dog, the only plausible exception being when you have severe weight or space limitations. If you don't have enough room for a dSLR and the above three lenses, then your problem is that you are bringing a dSLR, not the choice of lenses. If you have never shot SWA and now all of a sudden feel that because you are in Rome you should be shooting one you are setting yourself up for a disappointment and very likely lousy images.
When I saw the above recommendation I could have sworn that the author shoots landscape, where the need for a mid-range zoom is near non-existent. Very surprising to see this lens choice from a people shooter.