Would appreciate any suggestions between these 3 cameras as my wife will be on a cruise in late april. She needs p&s only and very simple operation. Which might give the best quality between Nikon 4600,Canon A510, and Nikon 3700? I have done research and am leaning toward the 4600 but little info to go on. If anyone has any thoughts toward any of these it would be greatly appreciated. I am wanting to stay in this budget range as I doubt that it would be used much except during holidays etc.