Cruises
How 'bout taking a cruise? She'll find it to be extremely romantic. Airfare and all transfers are included, usually. Shop carefully, though. This will be your trip of a lifetime and the last thing you want it to do is go south (sorry). For sure, tell your travel agent it will be your honeymoon, and you should get some extra perqs.
If you opt for a cruise, you better book soon. Cruises are usually booked up months in advance. If you have any flexibility, you might happen upon a cancellation, book a great trip and even save money.
Good luck with whatever you decide.