boil pasta until al dente (don't overcook pasta or it will get mushy) drain and cool
mince first four ingredients (red and green peppers, celery, and red onion)add to pasta
open and drain the pineapple (save the juice) add pineapple to pasta and vege's.
add shrimp and stir gently to mix all
put mayonaise, sugar, vinegar, and salt and pepper in measuring cup and mix well. Then add to pasta and vegetable shrimp mixture. Mix gently and adjust to taste. (some of the pineapple juice can also be added to taste but not too much or it will become too soggy.
cover, place in refrigerator to chill thoroughly which will blend the flavors. adjust the salt and pepper to taste. Enjoy.