I believe the answer is probably a mix of all of those, Lore Master. I would imagine that he did often visit Aragorn, as well as maintaining his relationships with the folk of Rivendell, Mirkwood and with the Dwarves in the area. Don't forget, Maiar too are subject to emotion, and Gandalf probably wanted to say goodbye to the vast lands that he had helped save from the hand of Sauron. I would imagine that between his visit with Bombadil and the Grey Havens, his main occupation was wandering about Middle Earth, talking to old friends and relations and visiting many lands, and saying cheers to the Mortal Lands forever.
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...where the instrument of intelligence is added to brute power and evil will, mankind is powerless in its own defence.
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