Also sunscreen.
If you have money, buy the HD video watch.
http://www.thinkgeek.com/gadgets/watches/a442/
Fedora.
Whoa.This too: http://www.thinkgeek.com/gadgets/security/dc78/
If you bring a laptop, use the lighter to get upskirt videos, or if you are going to be traveling with any young femanons, put this in their room with the lens pointed towards the majority of the room, or wherever they'll be changing. Then plug that into your computer, and plug it into the watch./perv
Anything else besides research watches and spy lighters?