In the original MySims for the Nintendo DS, currency is obtained through interacting with tourists visiting their resort town. By cheering up these tourists, your Simoleons will increase in numbers, and you'll be able to buy clothing, and other such items from businesses that open throughout town. You also obtain Simoleons by playing minigames that Sims throughout town ask you to play. The higher score you achieve during minigames, the higher amount of Simoleons you will earn each time.