DM
Decision made, the entire group turns around and heads back to Qelline Alderleaf's farm. You spot her once again working the fields. This time her son Carp is there working with her, seemingly resentful of the fact that he's pulling weeds while he could be playing. When he sees the group arrive he runs over to his mother excitedly and she gets up and turns to greet the group.
"Well. You brought more friends this time I see. I presume you are heading to the tunnel Carp told you about?"
He turns to his mother excitedly and says, "Can I show them? Please?"
Qelline looks at Carp with the stern look only a mother can provide, "You need to be very safe. Do you hear me? No nonsense. No adventuring. You show these good folk and you high-tail it back here instantly or I'll have the entire town go fetch you!"
With that the lad starts leading the group into the woods. As you leave the farm and approach the woods, you can see the back of Tresendar Manor. When you are just about to enter, you lose sight of the halfling for a moment. He had ducked behind a tree to keep somewhat hidden. He waves you forward and about 100 feet in he stops and points to a large tree.
"The tunnel is right there, in front of the big tree. See that bush and all those branches and leaves? It's right there. They musta had to dig around the roots. Anyway, that's where I saw them come out."
As you study the area around the tree you can see exactly what Carp was talking about. When you turn back to Carp you realize that he's gone. Evidently, he obeyed his mother and headed back.
You will probably need light to enter the tunnel.