Miss Middleton, 29, will not be told the destination of her holiday until after the royal wedding, according to reports.
She has given hints about the type of honeymoon she would like but has left the organisation to her fiance, sources told The Sun.
They will leave for their honeymoon the day after the April 29 wedding. Prince William, 28, is restricted to less than two weeks away since he is due back on duty for his search and rescue unit in mid-May.
Possible activities suggested include horseback riding in South America. Other suggested destinations include Jordan, Mustique, Kenya and the Seychelles.
While visiting Cairns, in Queensland, Australia, last month the Prince said he would like to return and go diving on the Great Barrier Reef. He said: "I will have to come back, maybe we'll have a honeymoon in Cairns."
Meanwhile, over-enthusiastic wedding guests will be told not to throw confetti at Westminster Abbey because it is not "in keeping" with the historic surroundings.
A spokesman for the Abbey said: "We don't encourage confetti. The Abbey is a place of worship, an institution. Weddings here are so few and far between they are regarded as a privilege, that don't require confetti all over the place. It is not really in keeping."