Well. I’ve done loads on this today! I think, in game time, I’ve spent some 12 days on it. I’ve explored a load of the island, found some animals, a jungle, some vines, loads of different fruit, built a better bed to sleep in (which helps to built stamina overnight), built a shelf, made a fishing rod and a bow and arrow, made a few shortcuts, and generally had a much better time of staying alive.
The next “big task”, it seems, is to build a raft. Not to escape the island though – oh no, that would be far too simple. It’s to get to the other side of a lake at the top of the mountain in the middle of the island.