If you also have a cell-phone and it allows tethering you can do this:
http://www.ehow.com/how_4480859_teth...t-laptop.htmle
That will allow you to use your laptop anywhere you go as long as you have phone signal. All the cell phone companies are different, so check with your carrier and see if they offer it.
Make sure you know what the data plan is so you know what you are allowed to do with tethering and any costs associated with it.