Final Quest

Your king sends for you.
"Esther," the king says when you arrive in the castle. The king has received you alone, which tells you just how important this audience is.
"I need you to go on a quest to find the green dragon," the king tells you. "Will you accept this quest?"
"I will, Your Majesty," you reply without hesitation. "But where is the green dragon to be found?"
"I do not know," the king answers. "He has not been seen here for hundreds of years. But if you go to the Forbidden Mountains, you may be able to find out where he might be. Alternatively, you could enter the Forest of Darkness."
What's it to be?