I carry a camera everywhere, because I never want to see something interesting and exclaim "I wish I had a camera!"
The only problem with that is that I find interesting things everywhere: a fading Nutrine advertisement in Brooklyn, the wet markets of Hong Kong, winding back alleys of Macau, the poker tables at Binion's Horseshoe in Las Vegas, catacombs in the Czech Republic, a umbrella shop in London. It is a compulsion I have no desire to rid myself of.
My occasional musings on my photographic travels can be found at my blog.