Watermelon is a refreshing and delicious fruit that is a popular summertime treat. It is a good source of vitamins A and C, and it is also a good source of lycopene, an antioxidant that has been linked to a number of health benefits. Watermelon is a member of the Cucurbitaceae family, which also includes cucumbers, squash, and pumpkins. It is a large, round fruit with a hard rind and a juicy, sweet flesh. A Watermelon Happy Sticker.