I mentioned some of what I wanted to do in a previous comment but the other half of the island (which exists only in my head, unfortunately) has many more plants - banana trees, ginger, berry bushes, many more sticks, ... essentially lots more to forage and collect that would be useful long term. I wanted to use palm fronds for all sorts of decorative reasons, as well as for a cape or cloak for Coco (even with that simple idea I didn't have enough time to visualise the art beyond the stick/pole). The two mystery boxes I hadn't (still haven't) solved. They were placeholders for items I might realise I needed (and/or items that would make for good jokes) as I was writing narrative stuff for the missing middle section, where you slowly set up your home and become more comfortable on the island.