For decades, parking lots at San Diego’s Balboa Park were packed, with lines of drivers snaking through lanes in search of a rare open spot. Last Saturday there were plenty of open spaces, and on Wednesday several lots were half empty, while people lined up behind kiosks to pay newly imposed parking fees. This month San Diego city imposed the first parking fees for the century-old cultural site, provoking confusion and contempt. Museums reported that visitation dropped 20% immediately, vandals