Oh I love that game! The prize is just a heartpiece, and if you beat your high score, you get 100 rupees. The easiest way to get to 10,000 is just to get ALLL the oranges and just fly around the others. You'll get like 20 or so in a row so your points add up reallly quickly. Now, if you want a challenge, try getting all the strawberries! I've almost done it, only missing it by one or two, but it is soo fun!