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 Mii Parade
You can add more Miis in Parade and audiences. Use Wii Sports to do it:

1. Make about 10 Mii's.

2. Transfer those Mii's to your Wiimote.

3. Delete the Mii's that are transfered to the Wiimote out of the plaza.

4. Start up Wii Sports.

5 When given the option of which Mii to use during gameplay choose the option to get the Mii from the Wii Remote.

6. After viewing the Mii's on the Wiimote back out by using the B button.

7. Exit out of Wii Sports and back onto the Wii Menu.

Now check the Mii parade and all 10 of the Miis that were on the Wiimote are in the parade. Now if you dont want the Miis on the Wiimote just delete them off. These Miis will now show up in all Wii Sports games that have an audience.

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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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Boxing:
If you jab the numchuck to left while curving it, it will hit them on their side.

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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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Bowling:
Tips-
Everyone has their own method and there isn't really one in particular that always works because there are so many things that could go wrong with other people's ideas. Personally, I go all the way to the right and aim between the "1" and "3" pins and throw it straight. But that doesn't work for everyone.
When you are bowling, remember that if you want serious curve, let go of the ball very soon, but if you want it to go more straight, wait until it has reached its max height before letting it go.
Codes-
After picking your Mii, hold:
Right for yellow/gold ball.
Left for red ball.
Up for blue ball.
Down for green ball.

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