Alright, here's the first floor so far. Lemme explain how this will work...
First, the map key.
Black straight lines are doors.
Red straight lines are locked doors (key)
Dark blue is diving water
lighter blue is swimming water
lightest blue is shallow water
yellow balls are special switches
green boxes are puzzle elements
brown boxes are chests
red boxes with black outline are locked hatches to the floor below
grey lines are ledges, a gap represents stairs
This is the first floor only.
So you'll enter in that little room in the bottom middle and proceed to the main room (yes I know I forgot a door there. There should be one). You'll go to the door on the left where you'll encounter an enemy (don't know what yet). Proceed to the door below. Come down the stairs and enter the door on the right. Fight off some enemies for a key (very basic enemies, again don't know what yet). Back in the previous room, unlock the door and engage the pressure switch by pulling it. A geyser will appear infront of the player to show that something has changed. This removes the pressure from part of the floor below. Backtrack to the main room and dive into the pool at the top to enter the next hallway. Another small enemy here, go to the door to the left. Hit the boomerang switch in the middle, causing 4 blocks to fall. The player must push the blocks together to form an image of the Zora's Sapphire in 60 seconds. Similar to the poe puzzle in OoT's forest temple. This opens the hatch in the caged room below. The other hatch is opened when the pressure switch from earlier is open. Entering the upper hatch, they'll be brought to the floor below to do something (don't know what yet) to get to the other hatch. Using a ladder to come up, you'll grab that key and backtrack to the previous hallway where you can now unlock the door. Not sure what's gonna come after that, but keep checking back!