What can I add to my islands?

Your welcome, and thank you for taking the time to look at the feedback. I do hope that it was helpful in some way.

Add an infinite sandstorm going on, not so much that it lags the user but like some sand blowing. Also for the rusted car tilt it downwards into the sand.

Also some details like campfires and stuff

And changing the skybox to something else, because I feel kinda lonely and weird in there when trying to explore your creation

Make it more of a low poly style since the corners are just blocks. The bottom of the island is also just sticks coming out. Looks very bland.

Keep working on it!