Think of a theme and stick with it for all of the parks. We have pictures of our boys looking into windows at all four parks (usually bake shops) and I am behind them and slightly at an angle so you get park of their face and all of them bending over to look in. We go frequently, so we have pictures of them in front of the same landmark so we can gauge how much they have grown. They also love fountains, so I have years of them laying on their stomachs reaching into fountains! HS has some awesome Star Wars "sets" that you can place your kids in and snap away---my boys love it. HS also has the movie set area that really does fool your camera lens and the scale is wonderful. The WS in Epcot is chock full of picture opportunities and it will look like your kids are world travelers. They can hold the "golf ball" in their hand (photography trick) or even the Eiffel Tower. Look around and let your imagination run wild.