Sanctuary Forest
Make your way across a stream and a pond, and then destroy a dangerous plant before using Roar as Laval to break open a stone wall. Turn the crank inside to open the gate and enter the Gorilla Region.
Hit some bricks and then assemble them into a claw wall. Use it to get over a large root and into another section of the area.
Use a Chi pad to power up and then pull on handles on a door attached to a tree. Climb a wall in the tree to get up to a walkway.
Switch to Eris and shoot at two targets in alcoves to lower a pad to the ground that can take you to the Sanctuary Forest.
Gorilla Village
Near the entrance to the Gorilla Region, switch to Gorzan and water a grow spot to cause a mushroom to grow. Bounce on it to get over a large root and into another part of the area.
Climb up a pounce wall to get to a series of walkways that are built around the trunk of the large tree.
As Gorzan, swing across a series of poles to get across a gap. Continue around to the pad to the Gorilla Village.
Gorilla Region Upper Levels
You need a nomad to get to the Upper Levels. They are the only characters capable of crawling though the hatch next to the pad to the Gorilla Village.
Bear Caves
Use a nomad to crawl through the hatch at the back of the area where the pad to the Sanctuary Forest is located. Then follow the path past a couple bear statues to get to the Bear Caves area.
Select a bear and use the fishing pole on the dock to pull a lever out of the water. Attach the lever to a statue and then rotate the statue and roll out a bridge you can cross to get to the cave.