First, I'd like to say, Disney Infinity needs signs! Minecraft has them, so they should also.
Now on Topic...
I'd love to make a world in toy box that you'd have to sail/jetpack to. You would sail from the start point that has the rules (hence, the signs) and go from one island to another. What these Islands have?
Certain Minigames
A few could be
Racing Island
Parkour Island (Look up Parkour if you don't know)
Gliding Island
Fighting Island
Now, after all of that, You would go back to the start and somehow we could make an area unlock. This area would use those tubes that shoot you a direction and send you to the grand finale.
Thoughts?