Watermelons are one of summer’s supreme pleasures: refreshing, good for you and fun to eat. The trouble comes when selecting one from that big bin at the grocery store. For greater selection success I'd recommend using the tips below as a guideline.
• When you turn the melon over, the light-colored patch on the bottom should be a creamy color, not white or light green
• Watermelons should be heavy for their size ─ after all, it's 92% water
• The rind should be slightly dull
• Thump it. If the watermelon sounds hollow, it's ripe. This is difficult for less-gifted ears.