Does anyone know if it's realistic to see Sagrada Familia, Park Guel and Casa Batlo in one day? I'm planning to make online reservations for Sagrada Familia and Batlo, one in the morning and the other late afternoon. I appreciate any adivce. Many thanks.
We did all these cites in 1 day. It was very do-able. We did it without rushing around. We visited Casa Batllo, Park Guel, then Sagrada in late afternoon.
We walked them all in one day, starting at Placa Catalunya, past Casa Mila, to Parc Guell, then back down to Sagrada Familia; it's a lot of walking. I don't know of a good public transit option to Parc Guell, you may want a taxi for that part of your day.
A few years ago when I visited Barcelona I took a hop on/hop off bus which took us past most of these sites.
We were in Barcelona this past February and from Placa Catalunya we took local bus #24 which drops you at the side entrance to Parc Guell. You pick it up at that spot for the return. They were running very frequently.