In a small bowl, combine the creme fraiche, orange and lemon juices, sugar and mint.
Peel and slice the bananas, put in a large bowl, along with the cantaloupe, pineapple, strawberries and grapes. Add the crème fraiche mixture and toss gently to coat the fruit with the dressing.
Put the salad into a serving dish or bowl and garnish with the kiwi slices.
I've also served this salad with a scoop of frozen yogurt instead of mixing in crème fraiche.