Any suggestion for activities/sights? We are doing a day trip to ronda but still have a day and one half more.
Really Discover Sevilla is a good tour company...small groups, several different tours offered. Use their services for a general overview and a bit of history, then explore on your own.
I am very fond of Ronda. You might want to investigate and see if either Arcos or Carmona might be a sufficient substitute. Before fans (especially Rick) of the others descend on me, I am not suggesting that these three towns are equivalent or identical. I'm just suggesting that Ronda is a ways-to-go on a day trip, and as noted, you are slighting Seville. (You get a Roman site as well near Carmona, if you have a car.)
Check out this page: http://www.ricksteves.com/tvr/sevillarse313_descr.htm Seeing a flamenco show (we saw the Casa de la Memoria one) and going on Concepcion's walking tour are must-do!