I'd sure try to bring both lenses and add something on the order of a 10-20mm. A lot depends on your shooting style, but you'll find lots of uses for every focal length between 10mm and 200mm. I shoot Nikon rather than Canon, but on my visits my principal lenses have been my 12-24, 24-120 and 80-200. Of the three I can cover about 80% of my landscape shooting with the 24-120, and the 12-24 is the next most useful. The 80-200 is only used when I need a little more reach than 120, principally to isolate landscape features. My 300 and 500 only come out of the pack when wildlife are on the menu. I certainly wouldn't recommend such long lenses on a tour.
You'll find uses for a polarizer, but I wouldn't leave it on the lens all the time. I use them less than half the time on most visits.