Mulberry Island is an island that Lisa and Nick go to.
Lisa and Nick decide to run away to have their first kiss under a mulberry tree on Mulberry Island. Abraham Simpson drives them most of the way until he gets stopped by police. They then row to the island where Nick proves that he is not as adventurous as Lisa first thought. Lisa goes to kiss him until she has visions of Hadley Richardson, Pauline Pfeiffer and a swordfish who tell Lisa that writers make bad lovers. Nick then says that he can't do it anymore and rows off, leaving Marge and Lisa to get off the island with floating shoes.