Why not spend a lazy afternoon at Playa de Santa Bárbara during your trip to La Línea de la Concepción? Check out the lively bars or top-notch restaurants in this walkable area.
If you're planning a bit of sightseeing during your trip, head to Casemates Square— just one of the monuments in central Gibraltar. Hotels.com travelers also say the area is full of friendly people and has lots of nice beaches. It's also full of great shops and restaurants, so you can spend the afternoon having a wander.