Some questions?

I don't leave for a month and a half but since I'll be quite busy right up till I leave I'm trying to get all my questions answered early. So here are a few:
1. I plan on keeping my pack as a carry-on on my flights, so I'm limited on being able to take certain items. Is it easy to by toiletry items such as shampoo. sunscreen, etc, as well as a small knife in SJPP?
2. To take a walking stick ot not? (not worried about footing, just dogs...)
3. I have both the Confraternity guide and the guide by Davies/Cole. Both are very good in different areas. The CSJ guide has lots of info on each town, refuge, but the cole/Davies guide has more maps and info on actually finding your way and highlights of the route. Should I take both or which one?
4. Is a poncho sufficient for wet weather?
5. How do other pilgrims deal with carrying valubles/important things (credit cards, airline tickets, passports and camera?) both on trail and around town if you leave your pack at the refugio.

Sorry for the long post. Thanks!
Lauren

Thanks for the quick reply.
I was thinking about bringing a light wieght sac I can sling across my shoulder to hold my camera in the evenings, and maybe one of those belt thingies for papers and cards.
I'd ideally like to take both giudes and a rain suit but I'm anticipating some trouble keeping my pack a managable weight. (aiming for 15lbs or less, and allready all the "absolutely necessary" stuff including water comes to about 16lbs!!)
Lauren