Gibraltar is a breeze to explore. Take the cable car up the Rock for stunning...

https://www.herotraveler.com/abdullah-undefined1/story/why-gibraltar-is-one-of-the-best-cruise-ports-in-the-mediterranean

Gibraltar is a breeze to explore. Take the cable car up the Rock for stunning views and meet the cheeky Barbary macaques. Later, wander down Main Street for tax-free finds or grab a drink in Casemates Square. It is a perfect, bite-sized day.