Sue.
Don't miss Seville. It is a beautiful city, and the trip includes what you could call a panoramic drive around some of the key points. There are some awesome parks, and when we were dropped off there wasn't a lot of walking. You end up at the Cathedral and there get your free time. Lots of tapas bars, and time for souvenir shopping. You can't get lost. :thumbup:
There is also a chance to go on a short river cruise( for which you pay extra) but the walking in the central city area is flat and it's a good chance to pick up some souvenirs. It's not a hectic city tour by any means.
Just make sure to take a bottle of water with you. 🙂