Preheat the grill for 10-15 minutes on high; brush the grates clean. Then set up your grill for direct medium heat at 425-450 degrees.
Lightly coat fruit with the agave syrup or guave nectar (optional).
Grill fruit directly on the grates.
Pineapple: 2-3 minutes per side
Strawberries: 2 minutes per side
Limes: 2 minutes per side
Peaches 3-4 minutes cut side down
Remove fruit and let cool. Dice pineapple, strawberries, and peaches. Combine all fruit in a pitcher, add the rosé wine and add guava nectar or agave syrup.