Best scenarios

Forest:
     Best: Standard(bandits) with berries and cave with ammo.
     Worst: Unicorn meadows (no 100% sure about this) with mushroom collection (Reset when ever you find mushrooms, they take two minutes)
River: (Note: Always jump the river)
     Best: Landing safe on the other side
     Worst: Getting flung into orbit (Again, this take minutes more than any other out come.
Great Plains:
     Best: Glitch event OR any event with only buffalo
     Worst: Getting picked up in a tornado OR having an axil brake OR finding a diseased animal OR running into zombies.
     Notes: Kill the women in the Red Dress. Also, the two not mentioned scenarios (Civil War and wheel braking) are not as bad as anything mentioned above. Never respond to gun fire!
River Two:
    Note: The desert has the fastest possible scenario but the ocean is safer and more consistent.
Desert:
     Best: Only animal encounters with temple encounter
     Worst: Alien encounter OR Ants (These are impossible to fight off)
Ocean:
     Best: Crab or pelican island encounter
     Worst: Squid battle OR Dino encounter 
     Note: The pirañas will always follow you so kill them. THE SQUID BATTLE WILL PROX A SECOND BATTLE AT THE END OF THE GAME. Never open the chest! 
Mountains:
     Best: llamas with quick pass through.
     Worst: Volcano OR Ninjas OR Avalanche.
     Note: Never choice starve if given the choice.
Fall:
    All are equally as bad
End:
    Best: Modern ending
    Worst: Normal especially Normal + Squid battle

Atomical_Sloths

Super Amazing Wagon Adventure

Quiplash

Eddward

lilypuff541

The Standard

The Fantasy

The Invisible

The Fast

The Glitch

The Wild

The Coal-Fired

The Diseased

The Alien

The Ancient

The Eastern

The Modern

The Fancy

The Survivalist

The Golden

The Random

The Meta

Wagon

Xbox 360