Arcadia is the smallest of the four main bays around Magnetic Island. Arcadia surrounds two of the Island's prominent bays: Alma Bay and Geoffrey Bay.

Geoffrey Bay is a Marine National Park Zone - which means no fishing or collecting - but is great for exploring during low tide. The old barge jetty, which is situated on the left side, is a great spot for feeding rock wallabies at dusk.

Alma Bay is a very popular swimming spot for local and visitors alike. The Arcadian Life Saving Club patrols the beach on weekends and public holidays. There are also public amenities such as a gas barbecue, picnic tables, shaded children's play ground, changing areas and toilets.

Alma Bay is also famous for its ANZAC Day Commemorations. Real-life soldiers from the Thirty-fifth Field Squadron (Reservist Engineers) annually re-enact the events that took place and make a dawn landing right onto the beach.