I am reaching Seville on April 17th morning and realized that April 18th is Good Friday and most of the things will be closed. I was just able to book a Flamenco show for that evening. I have a Cathedral and Alcazar tour booked for April 19th. is there something else I could see/do on Good Friday. Thanks
Follow the crowds and watch the processions!
Go see the Plaza de Espana, which is outdoors, or the Casa de Pilatos, which is indoors but open on April 18.
Take a long slow walk along their beautiful river. Both sides. Make a loop. Start at the Puente de Isabel II bridge, pick a side, and take a long slow walk to the Puente de San Telmo bridge and walk up the other side of the river.