I have the Canon 10-22mm lens and think it's a great lens. How if I could just get the lens to think I was a great photography everything would be perfect. What I am saying is that as good as the 10-22mm lens is, it has a pretty steep learning curve, so be sure to take a second lens along with you on your trip. Something like the 17-85mm lens would be a good walk around lens for sight seeing.
Exactly what I use on vaction or day trips.