The books don't end at Mordor. The shire has to be rescued too from Sauron's henchmen that had enthralled the King of the Rohan for so long. The four halflings get involved in a little direct combat.
The sailing away part for Gandalf and Frodo stretches the story a bit too. Some may recall that the father warned the daughter early in the Two Towers film that she would outlive Aragorn greatly and would wither among the humans. Therefore, she should leave with the others on the LAST boats to the west. This all takes place before Rohan's last stand and the whole plot of Return of the King. So what boat is this that takes our heroes to the new land of the elves?
The sailing away part for Gandalf and Frodo stretches the story a bit too. Some may recall that the father warned the daughter early in the Two Towers film that she would outlive Aragorn greatly and would wither among the humans. Therefore, she should leave with the others on the LAST boats to the west. This all takes place before Rohan's last stand and the whole plot of Return of the King. So what boat is this that takes our heroes to the new land of the elves?

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