Piotr, who continues to wear his studded leather, joins the last canoe, bow and arrow in hand. Dervish, who is wearing no armor, joins Spencer and Snapjaw in the first canoe if there is room or joins Korvir in the second canoe. Dervish lights up the Candle of the Deep in case there is some reason to need to see in the water. 

Can spencers darkvision see i to water ? 

Ooc - Chael will ready his Cloak of the Manta Ray for any underwater combat and insists on being on the same canoe as Snapjaw. He will row the canoe and keep an eye out for any dangers. Other than that, he doesn't have anything else to prepare. If we're going directly towards the bullywugs, he will handle out 1 antitoxin to everyone (the 5 antitoxin I asked if he could make in the private channel).

The rules for Darkvision state:

Darkvision

A monster with darkvision can see in the dark within a specific radius. The monster can see in dim light within the radius as if it were bright light, and in darkness as if it were dim light. The monster can't discern color in darkness, only shades of gray. Many creatures that live underground have this special sense.

The rules, that you link to, for underwater visibility (DMG, page 117) state:

Underwater Visibility

Visibility underwater depends on water clarity and the available light. Unless the characters have light sources, use the Underwater Encounter Distance table to determine the distance at which characters underwater become aware of a possible encounter.

Underwater Encounter Distance

Creature Size	Encounter Distance
Clear water, bright light	60 ft.
Clear water, dim light	30 ft.
Murky water or no light	10 ft.

So for Darkvision, the light category gets treated as if it were one better and the table would be:

Underwater Encounter Distance with Darkvision

OOC - Spencer has 330’ darkvision suggest in a boat up front to max the viewing distance when it matters.  Above water you'll see the full distance although that distance will likely be limited by the terrain to be less in most cases.  Tree, vegetation distance from the location of the canoes to the bank and where Vegetation, Tree, bluffs and so on would restrict it to that point.  See post about vision and water, Darkvision and water.  It doesn't differentiate how the vision is affected looking into water, I think its referring to being underwater and using you vision.  I would say if you are looking into the water darkvision might be restricted a bit more.  If you have any feedback let me know.

Canoes are 3 abreast, so all are at the same distance from anything they approach and from the left bank canoe #1 is closer then #2 then #3.  The right bank #3 is closer then #2 then #1.

Canoe #1 has Spencer, Snapjaw, Chael then Canoe #2 has Dervish, Korvir then #3 has Piotr and Pax.

Snapjaw says before the group get going, "I knows where the lizardfolk pickets are posted about half a mile out from the castle. Once we get that close I can see about adding to our numbers."

The trip there is uneventful and as you get closer to the picket of lizard folk you slow down and more toward the 6 lizardfolk with Snapjaw talking, " These are great warriors come to destroy the Cult of the Dragon, and that now is the time to make their move against the bullywugs." Snapjaw rolled well on charisma check.

Castle Naerytar was built on dry land, then a deep, dry moat was dug around it. When the mere expanded and surrounded the castle site, the moat flooded and overflowed. Now the whole site is swampy, and large pools of standing water dot the clearing. The castle was built on exposed bedrock, so its foundation is sound and mostly dry even a century after the flooding. Tangled brush and trees grow to within twenty feet of the walls on three sides of the castle. Only the front (southern) face is clear.

Bullywugs live in crowded, hastily made reed huts Northwest part of map. The lizardfolk have sturdier, roomier reed longhouses, Southwest part of the map.  The group and Snapjaw get out of the canoes further away so they aren't seen by the Bullywugs.  Snapjaw leads you to their longhouses and out of sight for the moment.

A half-dozen dugout canoes are pulled up onto land here. Three to five paddles lie in the bottom of each at the bank just north of the Lizardfolk southwest section of the map. Just south of the landing is an animal pen with several giant lizards (Pack animals) for the lizardfolk.

The lizardfolk keep their giant lizards penned here. The five-foot-high wall of the stockade is made from sturdy logs driven into the earth, spaced about six inches apart, and bound together with twisted fiber. The lizards can carry or drag loads that are too massive for the lizardfolk, such as large timbers or impressive crocodiles. They are also used to raise stone onto the castle battlements through ropes and pulleys—technology that never ceases to amaze the lizardfolk. There are several giant lizards in the pen at any given time. They are ill-tempered and attack anyone who comes within reach if their handlers aren’t present to keep them under control. The lizardfolk master of the giant lizards are there to maintain control.

The longhouses are made from reeds bound into long, thick bundles and bent into upside-down, U-shaped ribs. The spaces between the ribs are latticed and thatched with more reeds. Each longhouse has a single, woven door in the center of one end wall. The construction technique used in the longhouses is ingenious.

The lizardfolk are masters of their environment. They show the same building talent in their traps and snares.

Inside, longhouses are roomy and well ventilated. The ground is covered with reed mats, and the interior is dry and airy. Gear hangs from pegs on the walls to keep it off the ground. Lizardfolk are especially careful with their new, steel weapons, which rust quickly when exposed to dampness. They fill small stone ovens with coals for heat. There are no open fireplaces; the danger from sparks is too great.

Each of these longhouses could house twenty-five lizardfolk comfortably, and more with some crowding. When Rezmir first negotiated with the lizardfolk, they intended to move the entire village here, and built accordingly. As more bullywugs also flocked to the castle and the real situation became apparent, the warriors instructed their families to stay behind. Thus, they have far more longhouse space at the castle than they need. Characters observing the area from hiding and judging solely from the longhouses would estimate conservatively that over a hundred lizardfolk live at the castle. They won’t count anywhere near that many lizardfolk in the clearing. Snapjaw explain the discrepancy.

The bullywug huts in the northwest - A dozen or more huts are placed haphazardly on the boggy ground. Each is shaped like a slightly flattened dome. The doorways are open, but a low, short tunnel forces a creature to crawl into the hut. They are made of reeds woven through a lattice, with a generous layer of mud, grass, and dung smeared over the whole thing. Mud, swamp water, and muck slops between the huts and even flows in and out of the low, open doorways.

Inside the longhouses of the lizard folk Snapjaw gathers a few of the leaders and looks to the party for a plan, "We may need a bit to get all the lizard folk updated on who you are and once we have a plan to get things coordinated as needed.  So how can we work together?"

After Dervish quietly says the Guidance cantrip, Piotr responds. "Thank you for this opportunity to talk. I hope we can work together. He hopes his attempt to persuade the lizardfolks is successful (nat 20+1+1=22) Assuming success, he continues, I suggest we get the high ground. That means the castle. Can we get in there without being seen? Is there only one entrance or is there a secret way in? This means leaving the bullywulgs for later." 

Quote from BillM328897 >>

After Dervish quietly says the Guidance cantrip, Piotr responds. "Thank you for this opportunity to talk. I hope we can work together. He hopes his attempt to persuade the lizardfolks is successful (nat 20+1+1=22) Assuming success, he continues, I suggest we get the high ground. That means the castle. Can we get in there without being seen? Is there only one entrance or is there a secret way in? This means leaving the bullywulgs for later." 

 Dervish and Piotr rally the support of the lizardfolk.  Snapjaw comments, "We deal with everything on the outside.  You clear out the castle we want to keep castle too.  You keep treasure you find inside though.  Deal?  We need plan too.  It's late now.  We can rest and start first thing."