Golden brick #1

As Ellie, get the brick from the excrements - Herbivore Territory | Jurassic Park - secrets in free roam - Jurassic Park - secrets in free roam - LEGO Jurassic World Game Guide & Walkthrough
As Ellie, get the brick from the excrements. Then, switch your character to raptor and follow the smell of that brick. After reaching the destination, dig up the golden brick from the ground.

Golden brick #2

Switch your character to Barry and shoot the shields shown on the picture - Herbivore Territory | Jurassic Park - secrets in free roam - Jurassic Park - secrets in free roam - LEGO Jurassic World Game Guide & Walkthrough
Switch your character to Barry and shoot the shields shown on the picture. One of them can be found on the left, another on the right side of the gate. After destroying both shields you will receive the golden brick.

Golden brick #3

As raptor, jump on the rod shown on the picture - Herbivore Territory | Jurassic Park - secrets in free roam - Jurassic Park - secrets in free roam - LEGO Jurassic World Game Guide & Walkthrough
As raptor, jump on the rod shown on the picture. After that, go to the left side where you will find the golden brick.

Golden brick #4

As dilophosaurus, walk to the black container and destroy it with a spit - Herbivore Territory | Jurassic Park - secrets in free roam - Jurassic Park - secrets in free roam - LEGO Jurassic World Game Guide & Walkthrough
As dilophosaurus, walk to the black container and destroy it with a spit. Inside you will find the fourth golden brick.

Golden brick #5

Golden brick #5 can be found on the first floor - Herbivore Territory | Jurassic Park - secrets in free roam - Jurassic Park - secrets in free roam - LEGO Jurassic World Game Guide & Walkthrough
Golden brick #5 can be found on the first floor. Switch your character to Billy and use the climbing wall on the left side. You will jump to the other side with a parachute.

Worker in peril #1

Walk to the rope as Grant and cut it to save the jurassic park worker - Herbivore Territory | Jurassic Park - secrets in free roam - Jurassic Park - secrets in free roam - LEGO Jurassic World Game Guide & Walkthrough
Walk to the rope as Grant and cut it to save the jurassic park worker.

Red brick #1

Destroy the sewer barricade shown on the picture as pachycephalosaurus and walk inside as Timmy - Herbivore Territory | Jurassic Park - secrets in free roam - Jurassic Park - secrets in free roam - LEGO Jurassic World Game Guide & Walkthrough
Destroy the sewer barricade shown on the picture as pachycephalosaurus and walk inside as Timmy. On the end of the sewer you will find the red brick.