Here’s my selections;
1; Firearm and 100 rounds of ammunition (whatever caliber you are most accurate with) OR a bow and 50 broadhead arrows
I’d choose the archery equipment, for a few reasons, first, it’s reusable, and you can create more ammunition from local sources (bamboo or other sturdy tropical plants, feathers from birds, arrowheads from sharp stones or shell fragments), plus, it’s quieter than a firearm, so you have less chance of spooking your quarry, or if you’re using the archery equipment defensively, you won’t give away your position like a gunshot would
2; An extra-large plastic tarp with reflective mylar foil inner layer OR a 4-person dome tent
The tarp, it can be used as a windbreak, a lean-to, a simple tent, a roof for a small hut or other small structure, you can wrap it around you for warmth, mylar side in and use it as a sleeping bag, you can use it to signal passing aircraft/ships, you can put it over your garden at night to prevent animals from raiding it, you can use the mylar side to reflect more light onto the garden during the day, I suppose you could also put it over your head in case this island happens to have a Ravenous Bugblatter Beast population, the tarp is almost as useful as a towel…
3; A small crate of MRE/C-Rations OR a small crate of various vegetable seeds
I’d take the seeds, not only could you plant a garden for your own use, you could also create a “trap garden” on your hunting path, lure in the tasty hebivorus animal population and take them down with the archery gear (see, there was a good reason to choose the simpler archery tools)
4; A high-end “tactical” folding knife (like a Chris Reeve Sebenza or Spyderco Manix) OR a Victorinox SwissChamp Swiss Army Knife
Tough decision, the “Tactical” would be better for hard use, batoning into dry wood to split it for firewood, and other chopping duties, the SAK has the saw, fish scaler, and dedicated (if not a bit small) prying tools in addition to a pair of easily-sharpened blades, using a knife as a prybar is not the best idea, it’s not as effective as a dedicated prybar, high-end steels (VG-10/S30V/CPM-154/D2/H-1/Etc…) are a little more difficult to sharpen on primitive sharpening supplies, and S30V and CPM-154 tend to chip when abused, SAK steel tends to deform and bend when abused, and it sharpens up quite well on a simple rock, the “tactical” does have the advantage of a longer blade though, either one can dress game just fine, I’d lean towards the SAK, mainly due to it’s versatility, truth be told, a simple fixed blade like the classic Ka-Bar USMC knife would be the perfect tool in this situation, but that wasn’t one of the choices
5; A high-end “tactical” flashlight (and bulk pack of non-rechargable batteries) OR a can of gasoline (5 gallons)
I love a good high-end tactical light as much as the next guy, but I’d have to go with the gasoline here, you can use it to start cooking fires, create torches (the flame kind), create signal fires, the flashlight would only be useful after dark, and that’s the time you need to stick by your campfire anyway
6; A dozen Bic lighters OR a magnesium brick firestarter
The magnesium brick, it’s not reliant upon a volatile liquid fuel, and it’s unaffected by moisture, magnesium shavings burn at around 3,000 degrees and are capable of igniting even wet tinder, plus it has an embedded ferrocinium rod that’s capable of starting a fire with dry tinder on it’s own