On a personal level, money would be of little use other than providing the basic necessities and more of the same items. However, if I had truly unlimited money I would utilise it to alter this world for the better. To name just a few possibilities, I would purchase all available stocks in every possible company on the Earth, and wield my influence to prevent abuses of power and other evils. Ultimately, I would hope to gain enough power to bring down many such corruptions. Once I had gained enough influence, I would use this position to cease the promotion of all that is destructive to humanity's well-being, and encourage the promotion of all that is conducive to its happiness. After having purchased the appropriate stock and influence, I would then engage upon the destruction of all those organisations engaged in promoting warfare, conflict, discord and other evils; all possibilities of mass warfare would be eliminated, as would all other articles responsible for suffering. Having purchased a large portion of housing, I would make it freely available to anyone with a genuine need. Nobody on the planet would ever have to pay for electricity or water, and all would be provided with a certain amount of money to purchase food and anything else they desire - occupation would be a choice, not an obligation as it is for so many people now.
In addition, a dream I have had for a long time involves purchasing a large island, and turning it into a mini-paradise. Large forests and organic gardens would be present, and in the centre of the island I would build a large pyramidal structure, one which reached thousands of feet high and occupied a large area of land. The purpose of this grandiose structure would be to serve as a home for thousands of people, and to provide for all their needs. I would search far and wide for anyone interested in living on the island, and select the most deserving people, i.e. ones who are decent people and in need of a home. Everything would be free on the island, and everyone could live however they choose to... Of course, if I were able to change the world at large into a better place, this unusual scheme would probably not be necessary.