Grenadine adds a pretty coral tinge to this easy, festive drink, but it can be omitted.
In a large pitcher, mix guava juice, rum, lime juice, and grenadine. Pour over ice in cocktail glasses and garnish with slices of lime or guava.
Note: Nutritional analysis is per serving.
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.