You Do Need power plug adapter while traveling from Myanmar (Burma) to Cayman Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Cayman Islands are A and B and in Myanmar (Burma) are A, C, D, G and I. This is how they look like.

Myanmar (Burma)

In Myanmar (Burma), outlets of type A, C, D, G and I are in use.

Type A

Type C

Type D

Type G

Type I

Cayman Islands

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

Type A

Type B