North Island in Ghost of Tsushima
You will need to play until free roam starts.
Then mark and go to this place on the map.
Swim to the border of the play area.
You have to swim non-stop to sand bar 1.
A developer left this for you!
Swim to sand bar 3 (be fast)!
At this point, there is no more area limit.
You are out of the map! Swim to area 2.
Your destination is the pillar of honor.
Fast travel to area 1& 2 now possible.
After that, mark and travel to the next point.
You are near red trees, and you have to set the next destination.
Now you have to make your way to the Yamabushi's peak.
Learn about the fox.
And get a horse near the north cliff.
You have to get horse legs on a cliff and jump.
After that, go on the ledge and walk back on step.
Run jump (L3) straight then right.
If you fall on a ledge, you will pop up.
You will need to follow this path out of the map.
Below is area 3 of the map.
Use horse to Cushion fall jump.
And then jump down waterfall to water.
You have to follow the path to get out of the fort.
Go out gate to free roam area 3.
Mark the northernmost point on the map.
Go to the end game area.
Read sign for area 3 fast travel.
You have to pay your respects to fallen allies.
And then listen to the last Haiku music.
Bow and play the flute.
Finally, you need to try to reach Mongol ship.