

The remaining Tom Sawyer connection was justified through chapters in the original book where Tom and Huck enjoyed playing pirate games on the island, suggesting by extension that the Pirates of the Caribbean elements were all part of their vivid imaginations. The retheming eradicated much of the previous Tom Sawyer theme in favor of characters and elements from and inspired by the Pirates of the Caribbean film series. The Island received major upgrades, new show elements, and a complete re-theming in 2007 when it reopened as Pirate's Lair on Tom Sawyer Island. Though fishing ended, the fish that remained lived in the river for some time until one of the assorted river refurbishments. However, this proved impractical as catches that weren't released usually ended up in park garbage cans. A very early removed element was Catfish Cove, which during the opening summer of 1956, allowed guests to go fishing for live fish that the river had been freshly stocked with. Prior to the debut of Fantasmic! in 1992, when the south end of the Island was rebuilt to facilitate a stage for the nighttime show, Tom Sawyer Island saw very little change, though some elements were stripped down for safety reasons. The two children read a faux declaration from the Governor of Missouri that the island was annexed to the state of Missouri. For the attraction's grand opening, a fish fry luncheon with catfish shipped from Missouri was held at the Plantation House restaurant and two children from Mark Twain's hometown of Hannibal, Missouri playing the roles of Tom Sawyer and Becky Thatcher, were sent to Disneyland to participate in the dedication ceremonies. Days before construction was set to begin, he took the plans home and reimagined the landscape design, creating the inlets, coves, and overall shape that the island is known for today.

Sharing a strong affinity for the world Mark Twain created in his novels, Walt found himself unsatisfied with the island's original design. The attraction has the distinction of being the only one designed by Walt Disney. The area opened in 1956, one year after that of Disneyland. Otherwise, on opening day, the southern parts of the island were minimally landscaped to give the riverboat something to look at. Before the Tom Sawyer theme was chosen, other themes were proposed such as naming the island "Mickey Mouse Club Island" and serving as a club headquarters or making the island into "Treasure Island".
