Honeymoon idea: Make a postcard memory book. While on your trip, send yourself a postcard every day from wherever you are, then bind them when you return to have a journal of your trip. Then you'll have photos, stamps, and a rundown of each days events.
A ship in harbor is safe, but that's not why ships are built--they're meant to sail through the seas and experience many adventures. The harbor is deceptively safe--the ship will eventually rot there, without ever knowing why it was created.