I grew up with a father who hosted tickle contests on Sunday afternoons. It is a great activity if you need the kids to stop running around the house and just be still. A great transition from noisy, busy activity to quieter...
How it works:
Have your child/children lay on the ground all in a row on their backs. Tell them that the two rules are that they have to stay still and they can't laugh.
Start at the feet. Tickle the bottom of the feet for about 3 seconds. Do the next kid's feet, and the next until all the feet are done. Next do the knees. Tell them to bend them and then you start at the top and run your spreading fingers around their kneecap. Do one knee at a time and then move to the next victim. Next - thighs (that was always my worst) Next tummies. Next armpit. Next neck. I think we may have done ear every once in a while, maybe he blew in it or tickled it with a feather. Do them all for about 3 seconds. Don't do it until they laugh - that's not fair.
You will be surprised at how much kids get into this. Every kid I have ever played this with has loved it.
If you really want to make it a contest then you can say the first one who laughs is out or you can award points for passing a "level". They didn't laugh on knees, armpits and neck so they get 3 points. Highest points win.
It's fun to do it with a lot of anticipation. Start wiggling your fingers and saying "here I come" much before you actually do tickle. Sometimes they will bust out laughing even before you tickle them. It's so funny to see them writhing and squirming and tight lipped to suppress the inevitable laughter.
You can make it last longer by starting at the feet and going up and then working your way down until you lastly come to the feet again. You could also pull out a body part out of a hat and do whatever you pull. Put them in back again after they are picked. Some child may get feet over and over. You could even have the children write the little papers or have them draw a picture of the body part to be tickled.
With a younger child you can even practice body parts wen you tickle. Command at your child - "Tickle mommy's arm" "Tickle mommy's foot" "Tickle mommy's hair" you can also say to them - "I am going to tickle your nose!" "I am going to tickle your tummy!"