1st Switch

Turn around and follow the path. Draw weapons and shoot the dog. Run towards the left wall, turn around and shoot the killer on the balcony. Follow the passage. Kill the dog and the next brawler. He loses a small medipack. Jump into the river and dive under the boathouse gate. Behind it swim to the surface and push the button at the end. Dive back to the other side of the river and climb out.

Rooftop/1st Key

Walk into the building. Pick up the flares. And use the switch to get the trapdoor down. Follow the ladder. Leave it with a jump backwards before you reach the top. Push the second button to close the floor trapdoor and open the ceiling trapdoor. Use the next ladder to reach the roof. Shoot the window and climb into the building. Cross the hallway and climb out on the opposite side. Jump onto the red roof and from there towards the balcony. Take the Boathouse Key from the dead killer. (Assuming that you've killed him earlier on. If not, do so now.) Jump over the roofs back into the house. Turn to the right and shoot the dog. Follow the corridor which turns out to be a bridge. Push the switch at the end. Back in the hall shoot the window on the right and climb onto the sill.

Lever above the River

Perform a running jump to reach the canopy on the other side of the river. Grab the ledge and pull yourself up. Jump from one canopy to the next till you reach the ledge in front of the niche with the lever. Pull the lever and jump pack into the river. Dive back into the boathouse and use the key. (The gate door at the river opens.) Dive back to the other side of the river and shoot the killer. He loses Automatic Pistols. Dive back to the boathouse and get into the motorboat.

Motorboat

Take the motorboat to the right and through the open door. Light a flare. If you take the boat further you'll reach a waterfall. Drive down carefully. Follow the next corridor. And turn left. Follow the path to the end. Drive the boat into the lock. Leave the boat and dive to the pier. Pull yourself up and kill the rats. Shoot the window and the killer behind it. He loses automatic ammo. In the left corner you will find shotgun shells. Pull the lever to activate the lock. Leave the room and use the ladder to climb up. Jump into the water and use the lever to open the big door. Get back into the boat.

This next part can be solved in two different ways. There is a Long Way and a Short Way.

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a. Short Way

Take the motorboat around the corner to the left. Then right. Take your boat at full speed over the gondolas and straight on, to the big gate. Jump out of the boat while at full speed, shortly after you passed the second motorboat. (Your boat should go on, all by itself, and detonate the mines.) Dive to the jetty and shoot the killer. Collect the ammo. Jump back into the water and dive under the fence to reach the corridor. (Image) At the end follow it to the right. Then left. Pull yourself onto the pier next to the gondolas. Kill the badguy. He loses a medipack. Pull yourself up onto the bridge. Shoot the window. (1st image, below)

Secret 3:
Pull yourself up onto the bridge. Shoot the window and take the Jade Dragon.

Jump into the water on the other side of the bridge. Dive into the building at the end. (2nd image, above) Swim to the pier and press the switch. Dive under the closed door to get out of the building. (If Lara leaves through the window a countdown will start and the gate at the level end will close again soon.) Dive to the left. Then right, right again, then left and through the corridor again. Get into the second motorboat and take it through the open gate.

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b. Long Way - 2nd Key

Take the motorboat to the right. On the left is a jetty with a Killer. Jump onto the jetty and shoot him. He loses two packs of shotgun ammo and a large medipack. Climb back into the boat and take it to the end of the passage. There turn right. (Image) Hop onto the jetty by the gondolas. The door opens and a brawler appears. Kill him. Run into the room and shoot the two rats. Activate the trigger on the left. Get out again.

Secret 3:
Pull yourself up onto the bridge. (1st Image, below) Shoot the window and take the Jade Dragon.

Take the boat back through the narrow passage. Turn left. Shoot the killer on the pier to the right. Enter the room at the second pier. Pick up the Iron Key. Climb up on the right wall. In the room above a brawler and his dog are waiting. Kill both. Collect the medipack. Pull the lever. Return to the motorboat. Take it to the left through the passage with the clothes lines. (3rd Image) Left again and then right, past the pier where the killer was.

b. Long Way - 3rd Key

Go straight on and then turn left. Again right. Jump into the water where the gondolas are. Pull yourself up onto the jetty. Climb onto the highest block. From there jump towards the canopy and grab the ledge. Pull yourself up. Draw weapons. Jump over to the bridge. Lurking on the left are a dog and another brawler. From the bridge you can also shoot another killer on a pier a bit further down. There's another killer in the courtyard to the right. He loses an Iron Key.

b. Long Way - Watermines

Use the key on the door to the left. Inside the building drop through the hole in the floor. Use the switch. Climb out again. Draw weapons and shoot the killer waiting outside. Return to the boat and take it through the gondolas at full speed. Go straight on towards the big gate. Jump out of the boat while at full speed shortly after you passed the second motorboat. (Your boat should go on all by itself and get the mines to detonate.) Climb onto the pier where the killer was. Use the other key on the door. Shoot another killer. Pick up the medipack. Push the trigger.

b. Long Way - Switch for the Maingate

Get to the second motorboat and take it through the narrow passage which was blocked by some doors. Turn left and head through the archway. Turn right and into the narrow passage on the left. Left again. Position your boat towards the big wooden ramp and jump out. Swim into the room behind you and shoot the killer. Push the trigger. Dive through the gap under the door to get back out again. (If Lara leaves the building through the window a countdown will start and the gate at the level end will close again soon.) Return to the boat. Take it over the ramp at full speed, straight on and through the narrow passage with the metal gates. Turn left and take the boat through the main gate.