This is for the investigator challenge. It's easier to do this by starting at the ICA Safehouse, with a sniper rifle and a lockpick. This is so you can shoot the first two crocodiles quickly and to access locked doors.

#1 & #2 - Shoot the first two on the beach with a sniper rifle, and then proceed to climb off the roof in to the building next door.

#3 - Navigate through the apartment like I do in the video. Go down the stairs and you'll see the third crocodile in the hallway.

#4 - Exit the apartment building and turn right. You'll be going in to another apartment. If timed correctly, the owner of the apartment should walk out as soon as you get there. Just walk right in. Opposite the entrance is the room key. Turn left when you get inside and enter the bathroom, the crocodile is inside the tub.

#5 - Get to the beach. On the beach is a sewer entrace. Follow the path and unlock the gate. As soon as you get through the gate, turn right. The crocodile is wedged between an opening in the sewer.

#6 - Follow the coast until you get to the pier. The crocodile will be underneath it.

Congratulations, you just shot 6 inflatable crocodiles.