You Do Need power plug adapter while traveling from Syria to Solomon Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Solomon Islands are G and I and in Syria are C, E and L. This is how they look like.

Syria

In Syria, outlets of type C, E and L are in use.

Type C

Type E

Type L

Solomon Islands

In Solomon Islands, outlets of type G and I are in use.

Type G

Type I