OPEN and DRAIN the cans of fruit. Time permitting, drain the fruit in a strainer for 30 minutes.
WASH the grapes and cup them in half.
REMOVE the maraschino cherry stems and cut the cherries in half. (Reserve 2 or 3 cherries with stems for garnish.)
MEASURE out the sour cream and WHIP with a hand mixer until smooth. Use ½ cup for sweeter salad and use ¾ cup for less sweet salad.
FOLD the thawed Cool Whip into the sour cream. Gently mix in any flavoring extracts or powders, if using.
In a big bowl, STIR the pineapple, grapes, and cherries together.
MIX in the shredded coconut and nut tidbits.
STIR in the Cool Whip sauce until thoroughly combined.
ADD the marshmallows and mix until combined.
Finally, gently MIX in the mandarin oranges.
COVER and CHILL at least 2 hours and up to 24 hours before serving. This refrigeration blends the flavors, chills the fruit, and moistens the marshmallows.
SERVE cold, garnished with the reserved cherries with the stems.