You Do Need power plug adapter while traveling from San Marino to Mauritius.

Here is Why You Need An Adapter

The outlet and plug type used in Mauritius are C and G and in San Marino are C, F and L. This is how they look like.

San Marino

In San Marino, outlets of type C, F and L are in use.

Type C

Type F

Type L

Mauritius

In Mauritius, outlets of type C and G are in use.

Type C

Type G