In this fast paced world if you really want to give yourself a quality time you should visit Seville (SVQ). and interrupt sightseeing from time to time to have a few "tapas", those typical "small Spanish dishes", and a glass of Sherry wine in one of the probably thousands of bars in this city.
The best time to go to Seville is either spring (March to June) or fall (September and October).
What to avoid in Seville
Avoid buying Tapas in Jewish quarter as it is going to cost you well.
If you want to get through your hard earned cash very quickly, then a boat trip will do exactly this. Avoid this.