The Canary Islands are within close proximity to each other, so there are ferry routes from island to island. From Gran Canaria, you can take a day trip to nearby Tenerife or Fuerteventura, although you will need to plan ahead as sailings can sometimes be limited. It’s also possible to take a ferry to further destinations such as Lanzarote or even mainland Spain, although these journeys take several hours and there are generally only one or two weekly excursions, perhaps because inter-island flights are cheap and fast.