You Do Need power plug adapter while traveling from Cayman Islands to Canary Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Canary Islands are C, E and F and in Cayman Islands are A and B. This is how they look like.

Cayman Islands

In Cayman Islands, outlets of type A and B are in use.

Type A

Type B

Canary Islands

In Canary Islands, outlets of type C, E and F are in use.

Type C

Type E

Type F