It took a long time, but eventually players figured out the conditions required for the mystery golden peyote to appear. You must complete the whole game at least once, you have to have collected all the regular peyote already, and you have to have completed the mission "The Last One," in which you hunt down a guy in a Bigfoot costume. Oh, and also, the plants only appear on a certain day of the week, at a certain time, and only if the weather is set to snow or fog, which is itself next to impossible without a cheat code.
If you possess the patience and lack the job to meet those criteria, the game lets you play as Bigfoot.
Surprisingly in focus for once.
And it's still not over! If you collect all the golden peyote, you access a secret mission in which you, as Bigfoot, have to hunt down and kill Michael J. Fox's character from Teen Wolf.
Sadly, you don't get to kill the MTV reboot one too.