I am going to disagree, apologies, with those suggesting you don't make this trip. Certainly, it would be preferable to spend a few days in Sevilla, but if that isn't an option it is well worth taking a day-trip. It is a relatively easy drive, along main roads (though with traffic likely in places, admittedly), and you pass through some magnificent countryside for photo-ops. Leave early and you can be at the Alcazar by 10, then walk around the city centre and have lunch, see the "hospital" and cathedral in the afternoon, etc.
Since you are on your hols, presumably there is no rush to get back. So you could stay in Sevilla until the evening - some sights are open fairly late or just walk around the Jewish quarter - then drive "home", stopping at one of the roadside restaurante you will pass for dinner. As it's not a school night, you can sleep in or go to the beach next day to recover!
No hay ningun viaje malo, excepto el que conduce a la horca (or something like that, my Spanish is pretty dire).