In my opinion one of the most immersive environments in all of Disney...love the fort...love the caves.
Simply a classic. The island can be a nice break from the busy streets of the Magic Kindom. The barrel bridge is a favorite ever since a young kid, as well as the countless caves you can explore. However, keep a close eye on your kids in there I've seen many kids lost inside as it is a big dark maze. Other than the obvious *watch your kids please* the island is a lot of fun. Don't forget to head to the fort and watch the riverboat steam on by Thunder Mountain.
This area shows why Disney is a cut above the rest. Where else can you ride a log raft over to an island which features a running grist mill to explore, trails, spooky (not really) caves and a fort with a snoring solder and horses which twitch their tails?
When at the Magic Kingodom, this is where we bring our lunches and eat in one of the shady groves overlooking the Haunted Mansion and the Riverboat. At the grist mill, my daughter likes to find the bird's next in the gears..."Wow, he doesn't get hurt!" and to listen to the song being played...listen closely!
The barrel bridge is another favorite, as are the windy caves and fort with the snoring solder.
Lots to explore, kids will love this. Adults, too.
Tom Sawyer island is reached by taking the raft across the pond. On it, there are treehouses, caves and other things to explore. It isn't overly impressive but still makes a good attraction.