I try to bring something with me to do when I travel.  My thing to bring of choice is needlepoint.  Here's a before and after of the work I did while I was in Chicago. 

Before Front

After Front

Before Back

After Back

I think you can see how much I've did while in Chicago by looking at the back of the needelepoint.  By the way I bought this cute flower on eBay for 15.99 (with shipping)  Which is a steal since it was handpainted. The artist is: Tapestry Bazaar of London.