This video shows you how to travel to New Austin using the buggy method, this was found originally by Unlockable Eden Gaming and made travel to NA much better, the buggy is by far the quickest and easiest to manoeuvre out of all the possible methods.

Unlockable Eden Gaming
   / @unlockableedengaming4243  

Heres a few things you can do using the buggy:
Pick plants
Study dinosaur bones
Kill/skin animals
Loot npcs
Collect journal entries
Collect hats
Clear gang hideouts
Get the tiger striped mustang