>>2799751for self defense you just need some tools (like, a crowbar, or a shovel, or an axe or sheddy if you got one). The other most important tool for self defense is an extremely bright flashlight. Like, not less than 3000 lumens (real lumens, no chineaze lumens) but if you can find something that pushes 5000 or 10000 you'll be fucking set.
That will absolutely discover, blind, and disarm anyone at night near or far. If someone has their eyes adjusted to night vision and you blast them with one of those they will be blind for at least a couple minutes which gives you absolute upper hand. I keep my 3000lm spotlight next to the bed in case of a home intruder (even during the day this thing is blinding).
The only other thing that's going to help is just getting used to it. I used to get spoop'd out all the time alone in the woods even during the day, nevermind at night. But I just started doing it more; hikes, field recording expeditions, campouts, you name it. And after awhile you just get comfortable. You'll be fine.
Also this sounds fucking awesome, I'm truly envious of your cabin island. I wish you all the best in your renovations and enjoying this family spot.