阿水大杯茶(临沂平邑人民商场店)

This place has a great watermelon juice; it's freshly squeezed and you can taste the natural sweetness of the watermelon. I specifically asked the staff, and they said they don't add sugar or dilute it with water, so the sweetness is just the watermelon's own flavor—that's really honest. If you prefer it icier, you can ask them to add more ice cubes for an even more refreshing taste.