I'm visiting Madrid for the first time (for a long weekend) with a friend who is leaving tomorrow (Sunday) afternoon. I have one night to myself before heading to Seville. Any suggestions for a fun, last evening on my own? (We had a long, fabulous dinner the first night at Viridiana, and Saturday night we had dinner and saw the flamenco show at Corral de la Moreria). Didn't see anything at Teatro Real except for a 6pm show which will be too early. Any suggestions?