ehehe, have fun, which parts are you going? the weather should be much better than when i went, and you should be getting "sunny" indeed. were you one of those who emailed/pmed me about information? i can't seem to remember.
anyways, i didn't really use any cpl for any of those shots, it's hard to stack it with a gnd on the 10-20. besides, shooting at 10mm 80% of the time means that you get uneven polarisation. honestly, though, the skies in italy, when blue, are really blue. although you could say the same for singapore in good weather timings.