As stated before, you need to ask captain charles (port hope) for a shortcut. If you are lucky enough, you'll get shipwrecked there.
If you don't wan't to wait 20h every time you get on a different island, you CAN get the 7 POI in the small polar bear island.
There are exactly 7 POI on that island, I marked them on my map:
Just reset the points every time any of them is missing and you'll get the 7 eventually... It took me about 2 hours.
When resetting, stay with your camera borders at least 1sqm away from the point so you can't see it, otherwise it will not spawn.