Was it a margarita? Perhaps a pomegranate flavored one.
I have 2 different recipes.
1/2 oz Cointreau
1-1/2 oz
Tequila
1 tbsp fresh pomegranate juice
1 oz lime juice
Mix all ingredients with ice in a shaker or blender. Serve in a chilled margarita glass.
or
2 oz
Tequila
1/2 oz Triple Sec
1 oz lime juice
1 tbsp promegranate juice
6 oz ice
Mix all ingredients in a blender until smooth and frothy.
Having never been to the Marriot I have absolutely know idea just guessing. Did the drink have a flavor? Was in blended? Was it on the rocks type? Do you have any idea or guess what was in it? A little more info and we may be able to help you.