First go to game room, then pick watch 'em. Select all your coins and play, round 1 is easy as hell. It will double the selected coins. Then do round 2. After that just keep your coins. Continue this and you soon will have enough for 'Power Star' in the trade place.
To unlock duel mode get 3 duel mini games in shroom city. Once you get 5 duel mini games you get the normal difficulty in duel mode. Once you get all the duel mini games you get the hard difficulty. You get a lot of coins in each of these modes.
This isn't really a cheat but it's useful. Okay so let's say you want to go to Mr. I's house as peach so you can get his gadget. First you roll the die. When you start to move press the r button to look around. Look for the spaces that let you roll again. Look for one that is the same amount of spaces away as you rolled .Then move to it. I moved over 30 spaces with this strategy.
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