Too bad I wasnt around, I live and work in Ventura, but make it back down to LA every weekend almost. Some good locations mentioned...there are a few more interesting places downtown LA in addition to the Concert Hall and Angels Flight:

New Magnet School
http://scaredmonkeys.com/2010/08/24/...ng-out-idiocy/

The bench from "500 Days of Summer" (trendy Facebook photo spot =P)
http://www.500days.com/has-500-days-...mmer-bench-tom