The odds of seeing a stunning photo opportunity are inversely proportional to the odds of having your camera with you.
For the slight inconvenience of carrying a smaller point/shoot type of camera (I carry a Nikon Coolpix 950) with you, it saves kicking yourself later. And yes, three of my accepted photos on A.net are from the Coolpix 950. Just remember that when shooting with "only" a 2 megapixel camera, to get close and fill the frame with your image. You really don't have the luxury of cropping later.
Oh, and I carry it and other necessities in a 12" long by 6" diameter soft-leather shoulder duffel. OK, Ok, Ok..... go ahead and call it a male purse.
Maybe the women had the right idea all along. But I never miss a photo opportunity.