Ons belongs administratively to the municipality of Bueu, which has a regular ferry boat connection to the island, as have the mainland towns of Portonovo, Sanxenxo, Marín and Aldán.

The island has the only sustainable campsite in Galicia, with camping, cabin rental and glamping services.

It was one of the first nudist beaches in Galicia and can be reached by a two-kilometre path from the island's town centre.

[3] In 2001 the European Union designated Ons a Special Protection Area for bird-life.

In 2002, along with several other archipelagos off the Pontevedra coast, Ons became part of the Atlantic Islands of Galicia National Park.