Hiya!
You can safely do this with a few precautions.
Now, I don’t know how much you know about basic online security, so I am going to tell you what you need to do, and if there is anything you don’t understand, just ask – I will reply (tho the reply will likely be on Monday – am just about to start a very busy weekend).
First, if you currently have your passwords saved to your broker or bank websites, you need to delete all the cookies on your computer prior to coming and make sure you DO NOT save your passwords again until you get home. Typing your passwords every time is the only safe way to do it while in LOS.
Second, you need to set your browser to “clear internet browsing history on exit”. This will ensure that people will not see where you went on the internet if they get hold of your computer.
Last, you need to make sure that the connection between your laptop and your broker website is secure with SSL before entering your password. You can check this by looking for the little green lock at the top of the browser (IE). And clicking on it to ensure it is signed by Verisign or another security firm.
Some people will disagree, but if you follow the above steps you are about as safe as you can be no matter where you are. I have been securing business networks for almost 20 years, and while there are some more exotic things you could do, in your case I do not think they would help, but might hurt (using advanced techniques without the knowledge of how they work is usually counter productive).
Hope this helps… If you need advice while your over there, PM me and I will send you my IM info.
Frosty