The Pacific Princess transports a wedding party to Alaska for the nuptials of the son of a wealthy heiress and the granddaughter of a fiercely independent oil man. The groom's old friend does her best to ensure that the wedding never happens. The groom's mother tries to hide the truth about her crumbling finances. Her estranged ex-husband shows up uninvited in the hopes of making amends with his son. He befriends Capt. Stubing. The best man tries to make a play for Julie; but she cannot stop thinking about her ex-flame Jack, who lives in Alaska. The bride's grandfather and the groom's wisecracking aunt take a liking to each other, but are reluctant to admit they are in love. Isaac becomes obsessed with learning trivia about Alaska. Gopher tries to hit on the bridesmaids.

Carol and Doug's wedding is threatened by Natalie's interference and the financial problems of Doug's mother. Peter hides the truth about his health as he tries to teach Alicia the importance of living each day to the fullest. Buddy and Portia impulsively decide to get married. Julie gets swept away by the romance of the cruise and decides to accept Jack's marriage proposal. She finds an unpleasant surprise when she goes to his house with her answer. Gopher still wants to make time with the bridesmaids, but Capt. Stubing and his job repeatedly get in the way.

A man organizes a ""marriage-a-thon"" cruise, with special prizes to be given to the couple found to be the most compatible. At the same time, he tries to save his own crumbling marriage. Doc tricks Gopher into taking his place as one of the judges, but comes to regret it when the two attractive female judges constantly try to make time with Gopher. The single parents of one of the engaged couples come aboard with the hopes of breaking up their kids, who they think are too young to be tying the knot. A couple tries to finally get married after ten years together--and nine broken engagements. A groom decides to dump his fiancée, but skips the cruise and leaves his best man to break the news to the bride. The best man is Marv, the young man who befriended Julie when he was best man for another wedding on the Alaska cruise. He cannot bring himself to tell the bride the truth, particularly because he also has feelings for her.