Watermelon becomes as sweet as candy when dehydrated and the sugars intensified. Watermelon being mostly water, it will shrink up mightily.

Watermelon

Cut watermelon and remove flesh from rind. Cut flesh into ¼” thickness and remove as many seeds as you can. Place on lined dehydrator trays and dehydrate at 135 for 18-24 hours, or until it is as dry as you like it. Dry less for a chewy snack, more for a crisp version. Store in airtight container.