[Selmo]

Elrond rules out taking the Ring to Cirdan at the Grey Havens because it would be too dangerous. Frodo and the rest had only just made it to Rivendell and taking the Western Road back through the Shire to the sea would be anticipated by the Enemy; the road would be watched. Elrond was answering the argument that the Ring should by taken by sea to The West but it works the same for an attempt to go to Gondor by sea.

Also, Gandalf seemed to think it was very important to pass though Lorien, though he never gave his reasons.