Win the indicated Stock Car race near the airstrip in Grand Senora Desert to unlock the corresponding vehicle in your garage. Note: The Cheval Marshall Monster Truck will appear at Trevor’s airstrip at Grand Senora Desert. Additionally, these vehicles are exclusive to the PC, PS4, and Xbox One versions of GTA 5.

Race 1: Burger Shot Stallion
Race 2: Redwood Gauntlet
Race 3: Pibwasser Dominator
Race 4: Sprunk Buffalo
Race 5: Cheval Marshall Monster Truck 

 

Find one of the 27 hidden fat green peyote plants. Then, eat the peyote to hallucinate and transform into one of 27 unique animals, including a chicken, crow, hawk, dog, and seagull. Each animal can perform unique actions, including pooping with the seagull and barking and bitting with the dog. One of the peyote plants can be found near the lower gondola station on Mount Chiliad. Travel up the road that is next to the lower gondola station. Once you see the "Bell's End - Danger" sign to the left of the dirt road, go towards the cliff (the direction the "Danger" sign is pointing), then turn right and proceed forward to find two small wooden poles nearby with flapping red ribbons tied around them. Directly next to these two wooden poles is a peyote plant. Note: Playing as animals is exclusive to the PC, PS4, and Xbox One versions of GTA 5.