Day 1 Gaudí, day 2 the old city and waterfront, day 3 Montjuïc

Book the Gaudí time slots first; every other day moves around them

Leave travel time between the Sagrada Família and Park Güell

Day 1 dinner in Gràcia: small squares that fill up after 9pm

Day 2 starts at the cathedral, then El Born and Santa Caterina

Day 3: up Montjuïc by funicular, the Miró museum, lunch in Poble-sec

Day 4 is Montserrat; one- and two-day plans in the full itinerary