The most amazing thing that I saw in Gibraltar was the air-force jets screaming across the runway, which was part of the road onto the island. The traffic is stopped, just like a level crossing for a train and the jets scream off. It was one of the strangest sights I have ever seen in my life - although pretty cool.
One of the hardest decisions you will have to make if you go on just 1-day trip is what duty-free to bring out. There is a huge selection of off-licenses and a massive variety of drink and cigarettes to choose from!!!
Food won’t be a problem. There is plenty to select from, including a Burger King