Auto Hole-In-One:
Playing any par 5 hole, just about face and use the boost to shoot a ball into the space behind you. You'll be penalized with an Out of Bounds, but you'll score a Hole-In-One.

Easy Cash:
Playing the first round of any tournament or event, save your game on the 18th hole where you will get the End Game screen along with the prize money. Then return to Legend Tour, continue your game, and complete the event to get the prize for that event also.