Prepare this salad early in the day for best flavor at dinnertime.
Rinse broccoli and cut into small pieces that mix easily. Place in a large bowl.
Rinse grapes and cut in half. Add grapes, raisins, and pumpkin seeds to broccoli.
To make the dressing, mix the mayo, vinegar, honey, garlic powder and milk in a small bowl. Taste to make sure the amounts are right. The dressing should taste sweet but have a bite from the vinegar. If it is too vinegary, add more honey. If it is a little bland, add salt or more vinegar. If the dressing is too thick, add more milk. Dressing should be thick enough to be considered a dressing, but thin enough to pour off the spoon easily.
Add dressing to salad. Stir. Cover and place in the fridge for at least an hour. The longer it sits, the more the flavors blend and the better it tastes.