Oh, come on. This is very simple. Aragorn is King of Middle-Eart, basically. I think it would be very strange if he would go to the West. after all, the Elves bailed out and left Middle-Earth to Mankind, under the reign of the Numenorean line of Kings. He couldn't go into the West, due to the new order; Aragorn was the new order, after the Elves left. "Visiting" the west would be out of the question; there was no way back.