A rhythm that works
The single most useful rule for visiting Barcelona with children is to schedule one major activity per part of day and let open space absorb the rest.
A sample day
Rowing boats at Ciutadella in the morning, an early lunch, the beach or a playground after the nap, chocolate with churros as the reward.
Guard the midday rest
Whatever the age, a protected quiet hour, stroller nap or hotel break is what keeps the evening pleasant for everyone.
Save something for the evening
Barcelona stays up late, but with children aim for the early sitting at seven and a stroll afterwards rather than dinner at ten.