What public works do I need for my "perfect town"?

I can't remember where I read it but some PWP are counted as being negative, Garbage Can and Oil Rig, Tower etc will stop you having a Perfect town. I think only certain decorative items count towards 'Perfect' rating, so try getting rid of your signs and stuff, build fountains and benches, not lamps and clocks etc, see if that works for you? (:

I have a perfect town, and I don't think I have as many PWP as you do. My experience was that by looking at all my PWP I had a lot of them that were not environmental. I had a lot that gave my town points for abundant living, but next to none that boosted the points for environmental. So I destroyed some of the abundant living PWPs and built some more environmental PWPs and the next day my town was perfect! So you just need an equal amount of environmental PWPs and abundant living PWPs. Hope this helped!