The ten most difficult to remember world capital cities

For me they have to be certain Pacific and Caribbean islands:

Pacific
Nauru - no specific capital, but usually given as Yaren district.
Palau - Ngerulmud, which is in the state of Melekeok, on the island of Babledaob
Tuvalu - Funafuti
Kiribati - Tarawa Atoll; specifically South Tarawa.
Vanuatu - Port Vila
Federated States of Micronesia - Palikir

Carribean
Antigua & Barbuda - St John's
Grenada - St George's
St Kitts & Nevis - Basseterre
St Vincent & The Grenadines - Kingstown

Hopeful this aide memoire will help me remember.