I was in Seville in Andalucía and took a walking and bike tour with a company called Really Discover. For €20-25 a person you not only get to know about the history and culture of the city, but they use the time with you to recommend the great, cheap tapas bars; flamenco shows which don't cost an arm and a leg and are more authentic; monuments that have free entry at certain times, etc etc... A really good investment.