Just to give an example and tell you mine! here it goes.
Magic Kingdom, in front of Cinderella Castle. Guests sitting on Main Street. Bride arrives in Cinderella's Royal Coach in Cinderella style dress, and me in a Prince Charming Style tux.
I would also like to have the fab. 5 + Chip n Dale+ Woody and Bo Peep, and Buzz and Jessie sitting in the guest section. (Which probably would never happen but hey this is a Dream!)
The song that would be played during the marriage certificate signing would be "Promise" (which is played after Illuminations at EPCOT).
Then once we were announced there would be fireworks from the castle, like in Wishes, and walk out to the song from Mission:Space, I don't know the official name of it but it goes something like (Every mission makes out dream a reality)
Reception - In Fantasyland with tables all around, tables named after Disney Characters. Right before dinner is served, the lights go dim and then blue, white, purple lights come on and the music starts playing to "Be Our Guest" when the food is served.
First Dance - "So this is Love" with all the Disney Princesses and Princes + Mickey & Minnie, Woody & Bo Peep, and Buzz & Jessie.
At the end of the night we would leave in Cinderella's Royal Coach!