Pour the lime juice into a large juice pitcher, drink dispenser, or jug. Make sure the container is large enough to hold all the juices with room to stir.

Add the mango juice, papaya juice, guava nectar, pineapple juice, passion fruit juice, orange juice, and watermelon juice. Stir everything together until the juices are fully combined.

Pour in the grenadine syrup. Stir again until the punch has an even color and the grenadine is fully mixed throughout the juices.

Taste the punch before adding any sugar. Some juices and nectars are already sweet, and the grenadine adds extra sweetness, so you may not need much.

Add sugar a little at a time if needed. Stir well after each addition so the sugar dissolves and the sweetness is evenly blended.

Chill the punch in the refrigerator until ready to serve. For the best flavor, let it sit for at least 30 minutes so the juices can blend together.

Serve the punch cold or pour it over ice in glasses or mason jars. Garnish with fruit slices, cherries, pineapple wedges, or lime wheels if desired.