You are actually much farther aft than the Lanai - you are at the stern of the ship.
You may hear some noise if you are out on your balcony, but not from the Lanai or above. The nearest open deck to you is at the rear of the ship one deck down - but it is not by any public rooms.
You are actually over a crew staircase. As far as I can tell, you have a fair amount of steel between you and any public rooms, I would not be worried. I doubt any people will congregate on the deck below you, and if they do they will probably be sleeping.
Those look like fun rooms, and I don't see any advantage to a balcony cabin in terms of noise - you will still have the same amount of exposure, unless you go a deck or two higher.