In my area, local melons are starting to appear at farmers' markets.
When cutting up a melon (why pay twice the price—if not more—for pre-cut melon?) and removing the seeds, try to save as much of the goop that surrounds the seeds as possible.
This tender flesh (aka placenta) is edible and is usually very sweet. Plus, you paid for it.
The same principle holds for winter squash (butternut, acorn, delicata, etc.).