My son and I visited the Baoshan Cemetary by taking the subway on line 3 to Baoyang Road Station. Once you have exited the station turn left, and walk up the overhead pedestrian btridge. Cross at the pedestrian crossing next to the bridge, to get on the left hand side of Baoyang Road. The cemetary is a 15 minute walk (you have to cross 3 streets to get there). Look out for the brown tourist sign that states "Shanghai Liberation Memorial Hall" with a white outline of the memorial column. Another option may be to take a taxi from the railway station to this site.
The entry is free, but there is a security gate which has to be passed. The garden around the column was good, and there was a museum a sort walk away to the right. We viewed the museum, but it was not very interesting. the exhibits were mainly about fighters from the district who had fought in the various wars. Everything at this site may be viewed in 20 minutes.