First Congratuatulations.
Second...just out of curiousity where does your fiancee think you are going on your honeymoon? This is personal so don't feel like you have to answer.
Third, I concur with the others,
1) There are photo pass people in all the parks. They wear different outfits to fit the theming of the area but you can identify them by their large cameras. They will take your photo and give you a card (like a credit card) this will store your photos for you. You can keep the card and give it to other photo pass people and add more photos. There is no limit to the number of photos on the card. This is a nice feature because you are sure to get a lot of pictures of the both of you on your Disneymoon.
2) Throughout the parks there are Kodak Photo Spots. There is a small plaque and it shows you an example of a picture taken from that spot.
3) Pretty much anywhere would be a great picture spot in Disney but you might want some pictures in front of some romantic spots. I always find the gardens in all the the parks particularly pretty. And the flower and Garden Festival will still be going strong so Epcot will be nice.
4) Not pictures so much but.... If you are not shy, buy a pair of Mickey and Minnie Groom's and Bride's hats. You will get a lot of extra attention and maybe even some special treats from the Cast Members. If you don't want to draw that much attention to yourselves go to Guest Relations in the park you go to on your first day or if you are staying in a resort at the resort Guest Relations and tell them you are on your honeymoon. They have buttons you can wear (draws less attention than the hats.) For some reason, some people are not Disney Fanatics and might prefer to wear buttons.
Hope you have fun!