That was my thought as well; if it was me, I'd pack some Portra NC, and maybe a few rolls of slide film (Kodachrome in my case) for variety. A big trip isn't the time to mess around with film types you don't know well, or at all, save for the odd roll or two.
Since you mentioned photographing people a good deal, anything in Velvia is pretty much a no-no, and I'm sort of on the fence about Provia. Astia's a no-brainer here. So is E100G or E200.
These films will also be a bit less of a bear to scan. You won't have to work so hard for proper color balance, particularly with skin tones.
Simply my opinion, of course.
- Barrett