There ain't much to see on Broad Street other than City Hall.
Bring lights for night riding.
Through the end of October, MLK Drive is closed to cars between the Art Museum and it's end at the East Falls Bridge from 6 or 7 a.m. and 5 p.m.. although the 1 mile stretch between the museum and Sweet Briar is open to cars starting at noon (there is a shoulder and a parallel rec. path).