A Small Selection of Wii Cheats

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Change bowling ball colour

As The screen is fading to black for bowling, hold down the control pad until it fades to bowling for these colours:
Cheat Effect
Control Pad Up Blue Ball
Control Pad Right Gold Ball
Control Pad Left Red Ball
Control Pad Down Green Ball

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Wii Sports Hint - 91 Strike
In the "Power Throws" training game for bowling, you might notice 2 red buttons at the end of the alley - 1 left and 1 right. When you get to the final bowl for 91 pins, you can bowl the ball along the top of the barrier on either side and hit this button.

Move your Mii all the way to the left or right, and turn the aim 2 or 3 clicks towards the barrier. Let go of the ball at the highest point possible, with just a bit of spin to keep the ball on the barrier.

If successful, you will hear a click, the screen will shake and all the pins will fall down.

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Play Golf without maps or meters

To disable the power meter, map, and the wind speed indicator, press and hold (2), then make a selection at the "Select a Course" screen.

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Change the tennis court

To change the tennis court to the blue practice court, press and hold (2) at the warning screen that shows after selecting characters.

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Silver Boxing Gloves

After you've beaten the Grand Champion, Matt, in a boxing match you'll be able to wear silver boxing gloves. To do so, hold (1) when the screen becomes black before a boxing match.
 

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Unlockable: Tennis court
At the warning screen after selecting characters, hold down 2.

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Special Bowling Ball

Get to pro level to unlock a bowling ball with diamond designs on it.
Wii Sports Easter Eggs

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Scare Crowd in Bowling

To scare the crowd while bowling, start the regular motion for bowling and let go on the backswing. The ball will fly backwards and the crowd will scream and jump.
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Amuse Crowd in Bowling

To make the crowd laugh in bowling, move to either of the gutters in your lane, turn into opposite lane, and bowl so the ball goes over the barier between the lanes. The ball will go into the gutter in the opposite lane and the crowd will laugh.

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Training:
Bowling-
Power Throws-
Tips-
Once you get to the very last round with 91 pins, try to roll the ball along the barrier and hit the red light, causing a shake and an instant strike.
(This is reccomended for right hand dominant people)

Courtesy: gamespot.com/wii/sports/wiisports/hints.html | cheatscodesguides.com/wii-cheats/wii-sports/ | news.softpedia.com/news/Wii-Sports-Cheats-and-Unlockables-Wii-46781.shtml | neoseeker.com/Games/cheats/Wii/wii_sports.html