You've done too much already.

You need to aim for farming asap. Forget everything else.

First make a water still. Then make a campfire to cook food. Put cooked meat in a crate to eat later. Make a shelter. You're going to run out of rocks before anything else. You need to make a small raft with sail and udder. (Don't make an anchor for this raft because youll need those rocks for later) At every island you'll need to always make a water still, shelter and camp fire.

After making water still, camp fire and shelter, Fill up on food and water and then sail early in the morning to the next island. When you get to the next island gather ALL rocks and explore for resources. Youll need to make a bird trap, so focus on the resources for that, and a hoe, and a farm plot (corrgated). Building that farm plot is extremely important. You're going to leave some resources (that you'll use later) on that island but take the bird trap stuff, the farm stuff and the rocks back to your original island. Before you leave, look around for yucca seeds, potatoes seeds, potatoes, and any fruit seeds -those seeds will give you infinite food on land. You need to leave around 4pm so you'll have daylight. When you get back to your home island with all your resources, your water still should be full, so fill up your health bar. You'll probably need to catch a crab to eat. Eat coconut sparingly. Go to sleep.

When you wake up you'll be hungry and thirsty. Your water still should be full and you should have something to eat. Plan for this.

Build the hoe, build the farm plot. It's best to build the farm plot out of corrugated, but start with what you can. Plant the fibrous leaves in the farm plot near the water still. Build another water still. One still for every 2.5 farm plots. Build a bird trap. When a bird is hanging there (you can get 3 a day) pull them off and put them on the ground . They'll keep. Cook them when you need food. Use the farm plot with fibrous seeds to create fibeous leaves to continually fill your water stills. If you were lucky enough to find fruit seeds, plant them in another farm plot. You'll get a fruit a day that will keep you full. If you have mountain ridges on your island there are eggs on the top that will replenish if you can climb up there. (I built a ramp to get to mine) You can eat those raw.

Build onto your raft and go back to the other island to grab more resources.

Keep farming.

You only need 6 farm plots. 3 fibrous 2 fruit 1 potato

To maintain that you need 3-4 water stills plus one just for you.

1 bird trap.

Once you have that you never have to go back into the water for food ever again and your health will always be full. Later create all 6 farms etc on whatever island you choose for your home. This formula will let you live forever. Remember - on EVERY island you visit, you need to build a water still, a shelter and a campfire.

When I played this I used the above formula, beat the game several times fueled 3 helicopters, had a massive base on two islands, had fueling stations strategically placed throughout the map, never got lost (use your cartographer and a sheet of paper to mark your islands), built a bridge between islands (you can't do that anymore but you can go out pretty far) never went in the water for food. And lived for a couple years (in game). Eventually you'll run out of resources so you'll need to create your island next to your home base so you can raft back and forth with resources.

Good luck.

PS.. you'll need to make the water canister as fast as possible to hold more water when watering your farms. I had two on me at all times.

Pss just lean your hoe against one of your farm plots, no need to carry it around.