Well, in line with Kwaad there, I would fill up a giant building with gold coins and swim in them Scrooge McDuck style until I either got tired or realized the real world isn't a cartoon and you can't really swim in a sea of coins.
After that I don't know. On the one hand Nintendo has a business model that makes a good amount of money in the bad times and enormous sums of money in the good so why change. On the other they've built huge reserves of cash that never stop growing since they are basically perma-profitable so the urge to splurge would be there.
I'd say there are three options, which aren't necessarily exclusive of each other. First, the most conservative, is to buy up promising third party devs. Nintendo could use this to shore up 3rd party exclusives, especially key ones that Nintendo's 1st and 2nd party may lack. Second, spend money to massively increase production of the DS and Wii and drop the price this Christmas to $80-100 and $150-200. Lastly, and most risky, Nintendo oculd form an alliance with Apple and Disney. I don't know how but they could use the alliance to cross link the Ipod, Iphone, Apple TV, Itunes, Disney movies and IP's with the DS (or DS Advance), Wii (or Super Wii), and Nintendo IP's. It may not work but if it did it could in one fellswoop destroy the entire basis of the media box that MS and Sony are giving as the reason d'etre for the 360, PS3, and PSP.
