In a large mixing bowl, combine the strawberries, blueberries, pineapple, and watermelon. Gently toss the fruits together to mix them evenly.
In a small bowl, whisk together the lime juice, honey, and salt until well combined.
Pour the lime dressing over the mixed fruit and add the chopped mint leaves. Gently toss everything together until the fruit is evenly coated with the dressing.
Cover the bowl with plastic wrap and refrigerate for at least 30 minutes to allow the flavors to meld.
Serve chilled and enjoy your refreshing fruit salad!