New lens for Canada vacation?

We're off to Canada for our main vacation next month. Will be taking the D300 along with the following lenses - nikon 17-55mm f2.8; nikon 70-200mm f2.8; sigma 50mm f1.4

Question is this, will I regret not buying and taking something wider like the Sigma 10-20mm?

We're visiting Toronto, Vancouver and Banff.

TIA,
Steven.