Oh Gosh, I wish I was going with you! This will be so much fun.
For photo ops, you certainly want to get your picture taken in front of the following: First of all out in front of the Train Station (on the outside entrance) then in the middle of Main Street (which is right inside the entrance) the Sleeping Beauty Castle (especially if you can get someone else to take a photo of the group of you together) Space Mountain, The Matterhorn, The big lavendar leaves in front of the Alice in Wonderland ride, the Teacups, the pool where the Nemo Submarines are, in front of the Small World ride, standing in front of the elevated Tram, and riding on the Mark Twain paddle wheeler, and at least get one or more pictures with you guys with some of the “characters” that will be walking around.
I would highly recommend the Blue Bayou Restaurant. It’s a little pricey, but it’s so beautiful inside there. It’s inside, but they have made it appear as though you are sitting outside at night, complete with glowing fireflies and chinese lanterns. You can see the menu Here. If you have any vegetarians in your group, I can vouch for the portobello mushroom entree, it was delicious!
But I do agree with @muppetish if you want one of the tastiest sandwiches of all time, the Monte Cristo at the Cafe Orleans is fantastic.
Most of the rest of the food at Disneyland is so so.
If you can, you should also take a tour of the Grand Californian Hotel, which is also owned by Disney. You can ride the tram over there and back. It’s a magnificent example of Craftsman style architecture and they have beautiful artwork and a huge fire place inside. See it Here. The Grand Califonian Hotel has a handful of restaurants attached to it from sandwiches to fancy dining. The Napa Rose is a fancy restaurant. Or, for a more reasonable price, you might like the Storytellers Cafe which has homestyle food for breakfast and lunch, then a buffet for dinner.
Since your friend wants a Storybook wedding, there are lots of casual photo ops in front of the following rides: Snow White, Peter Pan, Pinocchio, and Mr. Toad’s Wild Ride, which are all located in Fantasyland. Here is where you are going to find Tudor-style half timber architecture and Black Forest style cottages with bottle glass windows and Victorian looking buildings. Sleeping Beauty’s castle is at the entrance (which will be the prime spot for photos for this particular theme) See the castle Here And don’t miss the Snow White Sculpture Grotto that is located in the fountain/moat directly to the right at the entrance to the castle. And the statue of Walt Disney and Mickey Mouse that is directly in front of the entrance to the castle.
And make sure you pop into as many of the Mainstreet stores as possible. All of them are decorated with quaint Victorian charm with lots of attention to detail (plus you can get beautiful ceramic figurines of all of your favorite characters.) One of the stores, which has some pretty pricey collectibles even has ceramic wedding cake toppers with Cinderella and Snow White.
I hope you all have a marvelous time and please give an update after the fact : )