A big thanks to Markus M for reminding me of this one. I actually saw it posted online a while back but never got around to trying it myself (no excuse I know).

"If a dog passes you from behind, you can accelerate and follow the dog from then on. This way you have several alternate routes to jog along. Also, along the way there are several depictions of 'Mario' painted on houses and stuff and a rotating yellow 'Bonus Star' on top of a Tree."

Have you tried the Wii Fit Ultimate Balance Test yet? Did you even know there was one? It's actually a little easter egg tucked away on the training selection page. To get to it, first select your Mii character in the Wii Fit Plaza and then, on the calendar page select training. On the training page you should see a little Wii Board bouncing in the background or running on the treadmill - click on it to take the test. Good luck - I certainly haven't managed it yet!