Why does the female character have to steal the arrowhead before going on for the tears of the moon, jungle cruise?

The female character steals the arrowhead before going on the Tears of the Moon jungle cruise because it is likely a necessary object or key to accessing the next part of the adventure. Perhaps the arrowhead is a special piece needed to unlock a hidden passage, activate a magical mechanism, or gain access to a sacred area. By stealing the arrowhead, the female character is ensuring that she has all the tools she needs to successfully complete the jungle cruise and retrieve the Tears of the Moon.