Here's another salad to make with watermelon:
In a bowl combine chunks of watermelon, tomatoes, arugula, toasted pine nuts and shredded Parmesan cheese. Add olive oil, salt and pepper. Toss and serve.
I had the salad for dinner with Parmesan crusted tilapia, which was delicious, but not pretty enough for the pictures. (I simply washed the tilapia filets in an egg/salt/pepper bath, and then coated it with shredded Parmesan cheese. I then cooked the filet in butter for about 5 minutes on each side.)