I agree with spending more time in Seville, either 3 or 4 nights at a minimum. Seville is beautiful with gorgeous architecture, plazas, fountains, lush parks, and many important historical and cultural sites. I would be frustrated with only 1 to 1.5 days in Seville, but of course we may not have the same interests. While I enjoy nature and the outdoors, I think the history and culture in Seville is not to be missed. There is the Alcazar, the cathedral, several small palaces such as Casa di Pilates, which was a quiet oasis when we were there in 2017. There are quite a few interesting museums, which we didn't have time to visit. Exploring Triana is interesting and a lot of fun. There are markets such as the Triana market and Mercado Barranca. Plaza de Espagna is stunning. Take a carriage ride, see a Flamenco show.