Lady Bethany and Rohan:
At the temporary headquarters of the Royal Navigator's Guild (currently a warehouse at the docks) the two of you find a brief note posted on the chalkboard in the window, just below the notice about the missing expedition:
"Out to Lunch at Inn, Back Soon."
After a quick trip up the road and a brief inquiry with the innkeeper, you locate the table at which the Royal Navigator is enjoying his fish. He seems an unlikely sort, an elderly gnome of unusually small stature and dressed in a purple robe, but on his pointed hat is the lamp-in-the-ship-wheel symbol of the Navigator's Guild.
Upon hearing your introduction, the gentlegnome seems highly impressed, and perks up immediately upon hearing that you wish to rescue the lost expedition.
(1d20+9=25 to Diplomacy; Navigator is now Friendly toward you)
"Oh, thank goodness you've come! Yes, both of you, sit, sit. I'll tell you all I know about the expedition..."
With teary eyes, he introduces himself as Irving Wiffle, the great-uncle of Melody Wiffle, the leader of the missing expedition. It appears that Melody, her husband Xyloph, a pair of halflings and their dour elven guide, Alamanthus, had departed two months ago intending to seek out the elven village their guide assured them was somewhere along the southern fork of the river. They have neither returned nor send word back, and Irving suspects that she was captured by the ghoul tribes or worse.
"Please, kind paladin! I beg you, return my niece to me, or at least... at least let me bury her in peace!"
Morazin:
The bartender informs you that the canoes are out back, and that you may borrow one for free, so long as you and your crew sign for it first.
Steffan:
(1d20+8+2=23 to Gather Information; subtract 2 gold for the cost of all the alcohol)
Your generosity does not go unrewarded: Several strapping young orcs toast your name and, after the round is drank, come over to your table to offer their services and advice.
Most of them are full of wild speculation about the dangers of the jungle and the various grisly fates that might have fallen the Expedition, claiming to have seen dire tigers, snakes longer than your table is round and even dragons out in the wild. The few credible claims are the solemn reports of the red aches, blinding sickness and ghoul fever along the river, carried by the filth, mosquitoes and the occasional stirge attack.
Most of them agree that 5 silvers a day would be a "fair" price for risking such dangers to subdue the no doubt ferocious beasts in the jungles, but you get the feeling that with a little luck and a bit more drink, you could talk them down lower. One particularly shady individual offers to sell you blue whinnis roots ("guaranteed to put any beast to sleep!") at the allegedly "low low price" of 50 gold each.