The clean-up will take place from 9am until 11am.
The public is encouraged to bring a hat, water and reusable gloves.
Communications and sustainability manager at the Two Oceans Aquarium, Helen Lockhart, said: “It has been estimated that by 2050 there will be more plastic than fish in the ocean. The time is now to make a difference and remove our bad habits. Studies have also shown that millions of seabirds have ingested plastic and a large number of sea animals die annually from plastic ingestion.
“Plastic has permeated into the deepest spaces of nature and has even entered the food chain. Plastic doesn’t break down, it doesn’t degrade and becomes part of the natural system again,” she said.