You can go snorkelling all along the coastline but some of the best spots are:
The rocky sides of Souda Beach, situated 3km west of Plakias. You drive west along the coastline or walk for 30 minutes and enjoy the stunning sea views.

Sto Limani or "On the Rocks" beach, situated at the west end of Plakias. The rock formations start just a few meters from the beach. Don't go there when the sea is wavy and the winds are strong!

The rocky sides of Shinaria Beach, situated about 4km (an 8km drive) east of Plakias. You drive east to Lefkogeia and take a right in the centre following the sign for Shinaria, or you can walk there using walk 1

Most of the supermarkets and some of the souvenir shops sell basic snorkelling gear at reasonable prices.
Always be careful when your go snorkelling, watch out for boats and when the sea is wavy it's wise to pick another day for your snorkelling adventure!

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Plakias, Greece