Which ingredient is NOT included in a Mai Tai?

In a traditional Mai Tai, the ingredients typically include light rum, grenadine (though it's not a standard part in some recipes), and pineapple juice or sometimes orange juice along with dark rum. The essence of a Mai Tai is the balance of rums complemented by citrus and sweetness from ingredients like orgeat syrup and simple syrup.

Peach schnapps, however, is not a component of a Mai Tai. This ingredient is often found in sweeter cocktails and does not align with the classic flavor profile of a Mai Tai, which focuses on the richness and depth of the rum and the almond notes from orgeat, rather than fruit flavors like peach. The Mai Tai is all about highlighting the quality of the rum and providing a tropical taste without the distinctly sweet characteristics of peach schnapps, making this choice the correct answer.