Tarp - Long term - Would be excellent to collect rainwater, however it is unknown what the frequency of rain will be.
Sunscreen - Consumable - Will run out eventually, you can avoid the heat by going under the shade or cover.
Toilet paper - Consumable
Pot - Long Term - Good for storing food or water or other ingredients collected around the island.
iPod - Consumable - Battery will eventually deplete and become useless, used to keep one sane for a brief time reminding of time before being stuck on an island.
Hiking Boots - LongTerm, would help climbing rocky terrain, depends if you already have shoes or feet protection of some kind. Depends if there is a high % of terrain.
Hand saw - Long term, though the edges will eventually erode, excellent for cutting trees and vines, almost a necessity for heavy-duty work.
Flare gun - Excellent in capturing attention, limited ammunition, excellent if passer by ship is near.
Inflatable Raft - Excellent for traversing the sea, but not reliable as it can puncture.
Flashlight - Consumable, battery will eventually deplete, easy way to lighten your way, long term on the island will make this useless.
Insect repellant - Consumable, will eventually run out if used frequently. Depends if there are annoying pests on the island, highly unlikely as mosquitos don't go near water that is often disturbed.
Hammock- long term - great for getting rest, but not ideal ergonomically, requires initial setup but beats sleeping on the ground.
Compass - Great for navigational use, especially when one is at sea, small, and can be lost unless tied. Susceptible to be broken.
Mirror - Excellent for personal hygiene and self-care. Can be used to reflect light. Susceptible to being broken.
Vitamins - Consumable - Good for temporary nutrition, but your body is able to create it own nutrients, depends on initial health before entering the island.
Water purifier - long-term - dependent if it can filter the saline. An alternate is Tarp for collecting rain water, but dependent on rain frequency.
Fishing Rod - Good for catching fish, however susceptible to damage and replacement of parts, can be substituted by making your own.
Rope - useful, has stronger durability, can use vines as substitute however.
5 ounces of weed - useless.
First Aid Kit - Consumable, will eventually run out if used frequently. But comes equipped with permanent tools like tweezers. Disinfectants are also useful.
Tent - Long Term, excellent for initial sleeping, reliable for getting reliable sleep without the pestering insects. Has higher levels of comfort.
Knife - Almost a necessity, portable for quick cuts, will eventually dull, however.
Matches - Great if waterproof, excellent for creating initial fire without a lot of setup.
Volleyball - useless, only for short term entertainment, great if you need to make an invisible friend.
If I had to select.
1. Saw -used for cutting trees and vines, the substitute would be sharpened rocks, but it would be more time-consuming. I can build faster with a saw.
2. Tent - can be used to get sleep, rest is important, can be modified into tarp to collect rain-water but not have the large capacity to collect.
3. Flaregun - can be used to get help, probability of unknown passerby ship.
4. First Aid Kit - will need the permanent use of tweezers and small micro tools.
I can replace the flare gun as I can create fire and burn the forest for a smoke signal, however it will also deplete the island's resources, depending on the island.
Would replace the flare gun with either Pot, knife, or Tarp.
This reminds me of Cast Away and Lost in Blue. For those ecchi then I recommend Are You Lost?
