Place the watermelon chunks on the cutting board and use a sharp knife to remove any remaining seeds, then chop into bite-sized pieces.
Repeat the seed removal and chopping process with the pineapple, cutting it into uniform chunks for easy mixing and presentation.
Transfer the chopped watermelon and pineapple into a mixing bowl, ensuring the pieces are evenly distributed.
Use a spoon to gently toss the fruits together until well combined, taking care to avoid mashing the chunks.
Inspect the mixture for seed presence, removing any remaining seeds for a smooth eating experience.
Serve the fruit salad immediately, displaying the vibrant colors and juicy textures, or chill for 10 minutes before serving for extra refreshment.