Some possible locations for islands:
Europe
- I tile west of Ponta Delgada. Represents the Azores and makes Ponta Delgada slightly less crappy. (43, 43)
- Some islands in the Aegean Sea. (69, 41), (69, 42) Not all of them need to be represented IMO. Adding islands to these tiles will do the job IMO.
- Near Hawaii. (4, 36)
- Bahrain and Qatar. (79, 36)
- Kuril Islands (117, 52)
- Reunion and Mauritius (77, 14). IRL, they are a bit more to the east. But this tile makes the accessible.
- Maldives (88, 27) OR (88, 28) and move the island tile 1 south.
- Various locations in Indonesia. (102, 27), (103, 23), (1089, 24), (107, 34), (110, 26), (110, 27)
- Kangaroo Island near Adelaide (112, 11)
Also, how could you forget to add pearl near Pearl Harbor?