On the day of the wedding, a tipsy Barney goes missing, and while out searching for him, Ted and Robin recall Ted’s former relationships. Meanwhile, Lily and Marshall clear up their on-going issues; and Barney imparts his women-meeting wisdom and techniques to two young wannabe ladies’ men., On the eve of the wedding, a tipsy Barney wanders out of the hotel, bumps into two hapless young men and takes them under his wing. Ted and Robin take a walk on the beach and have a heart-to-heart conversation. Marshall finds out that his hotel room is haunted by ghosts old and new.