The friends were amazed by their discovery of the lost treasure. But as they were admiring the gold and jewels, Lily noticed something strange on the back of the treasure map. It was a hidden message written in a language they couldn't understand.

"What does it say?" asked Max, curious to know what the message meant.

Lily studied the message carefully and realized that it was a riddle. "It says, 'To find the true treasure, you must first solve this riddle'," she said.

The friends were excited to solve the riddle and find out what the true treasure was. They sat down together and started brainstorming ideas. After a few minutes, Ava had a brilliant idea. "What if the riddle is talking about the island itself? Maybe there's something else hidden here," she suggested.

The friends immediately got up and started searching the island once again. They looked under rocks, inside trees, and even in the water. After hours of searching, they finally found a hidden cave that they had missed before.

Inside the cave, they found a small chest with a note attached to it. The note read, "Congratulations, you have found the true treasure. But the real treasure is not gold or jewels, it's the memories you made on this adventure."

The friends were touched by the message and realized that the journey itself was the true treasure. They hugged each other and decided to leave the chest untouched, as a reminder of their amazing adventure.

As they sailed back home, the friends couldn't stop talking about their journey and the hidden message they found. They knew that they would always cherish the memories they made on the mysterious island. And from that day on, they were known not only as the brave adventurers who found the lost treasure, but also as the wise friends who discovered the true treasure of friendship and adventure. The end.