You each pay 1 sp for a good fish meal with veggies and bread and an additional 1 sp to sleep on a straw pallet in the back. You awake, pay 1 sp for breakfast, and head to the docks where Rory is waiting.
"All right, it's good to see you didn't have second thoughts. First things first, gold please."
"Here you go... (hands him 30gp...) seems there'll be a smoke signal letting you know when to ferry over for us... I didn't get to ask you yesterday - anything you know about the hill?"
You all board the ferry/raft and push off. The current is slow but since the river is so wide, it takes a while to cross. After three turns, you're about halfway across and can see two clearings, one north and one south. The south one has a waterfall. Everywhere else there's underbrush and no clear spot to land. Rory speaks, "So where do you want to go?"
It takes three more turns to get to the clearing. It's a pleasant expanse of grass and flowers that surrounds a 15' waterfall, with the stream going down to the river. The water looks cool and refreshing. The clearing itself is about 900' E-W and 1200' N-S, with the waterfall in the NW corner and the stream running SE. There's a trail also in the NW corner but everywhere else it's a thick tangle of trees and underbrush.
After you disembark, Rory says, "Good luck to you!" and pushes off again, back towards the fort.
Wilhelm immediately gets out his ink, quill and map book, to make accurate sketches of their boat ride and the shore line of the island.
"Wow, that waterfall looks beautiful. and it would be a natural place to start looking, as it's a resource used my men and animals alike."
I'm certain this serene setting won't be as peaceful - or as evil as rumor and first impressions.
We should begin by looking in the stream and at the waterfall, perhaps there is a passage behind the falls which leads into the hill... Also, we may see signs of refuse in the water or streambed if they use it as a sewer or to remove refuse - to gauge what we may be facing. What is the wildlife like? Birds chirping etc? Let us know if/when there is a change in "natural" sounds.
It takes you three turns to cross the clearing to get near the waterfall. Investigation shows no passages behind it. The stream is clear and clean, no sign of refuse. No real signs of wildlife, but everything seems fine - usual noises, birds chirping, etc.
The only trail is the one mentioned in the NW corner, about 300' away from the waterfall.
** Okay, here's a map. The Party is represented by the purple "P", the trail is red, thick underbrush is the green, the river is dark blue, the streams are light blue, and the Fort is to the east.