Congratulations on your engagement!
I think the other posters are right in that it depends on your history with visiting the Disney parks.
A good place to start is the Disney website, as previously mentioned, as well as the
Disney Honeymoon Registry. DH2B and I have been living together for a verrrrrrry long time, so we opted to register for things we'd like for our honeymoon, rather than the tradition blender, toaster, towels, etc.
I would recommend to choose the "Browse All Categories", rather than getting pigeon-holed into one type ("Relaxing", "Adventurous", etc.)
We chose things like Sea Raycers, Dining with an Imagineer, Carriage Ride, money for the Food & Wine festival, Mickey ears, holiday ornaments. What's so great about it is that all of the money contributed goes onto a Disney gift card. So if you're unable to secure the carriage ride reservation you wanted, or if you don't find a holiday ornament that you love, you can use the money for whatever you want at the parks & hotels.
