plot hole (*spoilers*)
I know, this isn't a masterpiece, and there are LOTS of things that you could nitpick, but here is one I noticed:
When they return to the island they find the thatch house that Em and Richard had built and lived in. I got the impression that the house was supposed to look kind of old, like "somebody lived here long ago".
The thing is, the total time from when Em/Richard/Paddy drifted out to sea until the new folks arrived can't have been more than a few weeks.
Shouldn't the house still look more or less intact and recently lived in?