Here are some simple stuff for today:
Niue, a semi-indepenent nation that is for most purposes part of New Zealand.
The Maldives. The tile didn't include every small island and atoll, so two administrative divisions don't have any apparent land at all on the map.
Also, some islands/archipelagos that can be considered done, since they have no administrative divisions:
•Palmyra Atoll - Uninhabited atoll, territory of the US so no adm. divisions.
•Rapa Nui/Easter Island - All of it is considered a single commune of the Valparaiso Province of Chile, so no need to map.
•Christmas Island - An external territory on its own, no adm. divisions
•Cocos Island - Same with Christmas Island
•British Indian Ocean Territories - Uninhabited British atolls, so no subdvisions as well.