wow that's a tough one!
let's say a gigantic bottle of V05 conditioner... like the size of a small car. i went overseas to buy it, and ironically it's the only thing that washed up on shore with me after the shipwreck. i will find myself a sharp rock on the island and carve myself a bone comb or something if need be, and put my hair in box braids so i won't have to deal with it (cuz ya know, i will be busy hunting/fishing and fighting off wild animals that wanna attack me). when the bottle gets low enough i will cut off the top with my sharp rock, turn it into a small boat and sail my happy butt home
I love it!!!!
Does it have to be a hair tool? because I'd bring this:
one of these great Swiss army knifes of course!
I can cut and smooth me a wide-tooth comb out of some wood or something, but I'll smooth it out with the knife until Im positive it wont snag. I may have to use my army knife to kill a poor little porcupine and then I'll use the scissors to clip off needles. I'll have to use fire(heat) and some natural made glue so I can create a small bristle brush out the porcupine needles--of couse they can't be to sharp so i'll have to cut the pointy tips off with the scissors and smooth it down. I can use that cork screw or the knife to punch a hole in the coconuts to use for my co-washes. I can also seal in moisture with aloe gel from plants and with oil from those beautiful avocados on the trees over yonder. To get rid of coconut milk build-up, I'll just use the citrus juice of the fresh oranges hangin on some of the other trees. I dont need a scarf: When I sleep on my stomach, most of my hair will lay on my smooth back (in a long braid at night of course
).
Whatever can't be found in nature to take care of it, it doesn't need. But I don't think I can fashion a man out of anything growing from a tree. Um, I mean a real man, not a, um, makeshift one. 
Okay, a couple of y'all are getting really creative. But if I'm on a beautiful tropical island, I'm bringing me some fine @$$ dude and I'm locking my hair!
Girl, I like how you think!!!! 
Okay, a couple of y'all are getting really creative. But if I'm on a beautiful tropical island, I'm bringing me some fine @$$ dude and I'm locking my hair!
wow that's a tough one!
let's say a gigantic bottle of V05 conditioner... like the size of a small car. i went overseas to buy it, and ironically it's the only thing that washed up on shore with me after the shipwreck. i will find myself a sharp rock on the island and carve myself a bone comb or something if need be, and put my hair in box braids so i won't have to deal with it (cuz ya know, i will be busy hunting/fishing and fighting off wild animals that wanna attack me). when the bottle gets low enough i will cut off the top with my sharp rock, turn it into a small boat and sail my happy butt home
A mirror so I could see my wonderful retention because I wouldn't have a comb to pull my hair out. Oh, and a digital camera to record that growth!!!!
I'd save all of the pictures on my card until I was rescued and then post them here.
You cheated! You can only pick one thing...
Okay, a couple of y'all are getting really creative. But if I'm on a beautiful tropical island, I'm bringing me some fine @$$ dude and I'm locking my hair!
...just j/k 
AAAWw man, i already said i'd bring that swiss army knife.. well maybe I can find some cucumber plants on the island
