Head to Park Güell, a UNESCO World Heritage site designed by Antoni Gaudí, where your family can wander through vibrant gardens and imaginative architecture.
Take the metro to Vallcarca station and walk 15 minutes uphill to the park entrance.
After lunch, enjoy some relaxation time at La Barceloneta Beach, where the kids can play in the sand while the adults unwind with a view of the Mediterranean.
Take bus 45 from Jaume I to Barceloneta or walk for a leisurely 25 minutes.