Will be traveling there for a 2-day business trip alone and would like to do a bit of sightseeing as long as I'm there. Any recommendations for tours, things I am okay to do on my own, etc.? I'm fairly adventurous, but not great at hiking, biking and other sporty things. I'd rather do non-touristy things, but since I'll be on my own and my Spanish isn't that great, I think I'm better off joining a tour. Also, how many extra days should I plan to stay there?