Peel and chop the pineapple, mango, and banana.
Add the pineapple, mango, banana, Greek yogurt, chia seeds, and coconut water to a blender.
Blend until smooth and creamy.
Add ice cubes for a colder, thicker smoothie and blend again.
Taste and adjust the consistency with more coconut water if needed.
Pour into a chilled serving glass.
Garnish with a pineapple slice or fresh mint leaves and serve immediately.