Hey Talia - Congratulations on your forthcoming wedding and I think WDW is the best place in the world to spend your honeymoon.
Now you can get some great tips from the whole of this DIS site as well as those that Kristen has already mentioned.
Please let me know if you like food and dining - I'm a real foodie any my vacations at WDW are always based around the food so I'll be happy to give you some suggestions.
I'm sure you've gathered that everyone has different must do's at WDW here's a few of mine and if possible get the Mickey Bride and Groom ears they'll add to your fun and enjoyment during the honeymoon.
1. Ask to sit up front of the Monorail when going from the Ticket and Transportation Centre to Magic Kingdom
2. Eat at Jikos at the AKL it's a most amazing place to eat - the filet mignon on a bed of Macaroni cheese (the best I've ever ever tasted) is to die for. Ask for a window sea as you can see water falls and it just seems very romantic
3. Plan some character meals and wear your ears these are such fun and aren't just for kids

I really enjoy Liberty Tree Tavern, Crystal Palace and Cape May Cafe
4. At MK do not miss - Pirates, Peter Pan, the Mountains, Buzz Light year and the best 3D I've seen in a very long time Mickey's Philharmagic! The new night-time Wishes fireworks are unbelievable and are not to be missed.
5. At Epcot do not miss - Test Track, Ellens Energy Adventure ( I love Ellen she makes me laugh), SpaceShip Earth, Honey I shrunk the Audience. A nice walk around World Showcase will help you feel that you left the country for the day - it's fun too if you add a drink here or there - great bellinis in Italy

The Illumination are spectacular - as it's your honeymoon you may want to try and organise a special fireworks cruise to see the fireworks.
6. At MGM do not miss - Anything LOL I love this place.
7. At AK - I love the Safari but try and do this as early as possible as most of the animals are up and about and easy to spot before the heat hits them and send them into the shade. I love Dinosaur and Tough to be a bug and walking by the Tigers and the Apes too.
8. Whilst staying at AKL try and do some of the special tours they organise around the resort they are all free and help you to really enjoy the resort.
Hope all that helps for now