Here's my remake for the Nintendo Ds/Ds Lite:

The top screen would show all the gameplay and would function as the regular tv screen when playing the regular Adventure of Link.

The bottom screen however. Would hold some sort of an inventory(Spells,Minimap, Experience points and so on). Also, I would add some extra dungeons and more interactive villages with villagers that didn't say the exact same thing over and over again.

That's basically what i would add...And perhaps some extra spells.

__________________

Proud member of the Humulation Army.