the hinterlands was designed so you couldn't do everything, you could look it up what has already been discussed on the forum or clarified on the dev logs, one of the 3 quests is very much a red herring. the best out come is spending the first 3 days to build the bond with P and Storm, and the next 3 days on the other quest. then, in the last day, you can find a secret location that's unlocked by that quest. the hinterlands 3 could very well be a stand alone project, and is very much worth checking out all the different places and trying to uncover it's mysteries.