I wrote a guide that you can download for free and I would like to complete it with your experiences.
https://sevillaqr.com/free-seville-travel-guide-book-pdf/
I would like you to recommend places you have visited in Seville. As a local I know a lot but sometimes visitors discover things that we locals don't know. These tips may be useful to future travelers
You can climb the Teide. I climbed up to the refuge, spent the night in the refuge and went up to see the sunrise at the top.
To spend the night in the refuge you must book in advance although the refuge is currently closed.
https://www.volcanoteide.com/es/refugio_de_altavista
Hello, it is usually not necessary to buy Mosque tickets in advance. You can show up there and buy the tickets at the ticket office. If I remember correctly, the access includes an audio guide.