Aladin Carpet Minigame:
Go outside Agrabah, and then go to the Ruins, and fly the Carpet over to the tower where you fought the clone Jafar. Go inside and go up the stairs and there will be a stature asking you if you want to touch it or not. Touch it and the mini game will start
Halloween Town SkateBoard:
Go to Yuletide Hill and talk to the kids in the devil costume
Twilight Town Skateboard Streetrave:
Go to where you find the bulliten board to play the Cargo Climb, Mail Delivery, and Grandstander mini-games, and walk over to the shops down the hill. Next to one of the shops there will be a lady, talk to her to start the minigame