While the island does not feature a ton Disney, it is still a classic Disney attraction.
As a boy from Missouri myself, there is a lot of midwest feel in the island. With Disney being from Missouri, any Disney fan knows how much the midwest played a role in the development of his classic Disney films such as Song of the South (featured in Splash Mountain).
Tom Sawyer Island has several tunnels and pathways that makes it a fun "big kid" playground. Smaller kids will have fun as well, but the floating bridges and different paths just take you back to being a kid out playing in the woods (once again, I am from Missouri haha).