In side the volcano lies the Mysterious Island, a Jules Verne themed land.
The attractions are 20,000 Leagues Under the Sea (not the same as the the ride that used to be at Disney World) and Journey to the Center of the Earth.
Look, the Nautilus!
No, we won't be riding in it, since it is just a prop.
Journey to the Center of the Earth is my favorite ride in Disney Sea, so far. It is slightly roller coasterish (tight turns) and makes good use of Disney Imagineering.
Like all Disney rides with long lines, there was lot to see while waiting.
The Mysterious Island also houses a small gift store (with no Mysterious Island themed items- at least this visit), a Chinese restaurant, a restaurant with a view of the Nautilus, and snack carts.