Look at this excellent map - http://www.orangesmile.com/destinations/img/athens-map-big.jpg - (click & it gets huuuge, use side sliders to put Acropolis in center)... Actually all your sites are shown there, tho without a "key"
• Dionysus & Herodius Atticus theatres are #12 & #73 on S. Side of Acropolis... temple of Themis is really just a foundation, in between the 2 theatres
• Aeropagus Hill (also called "mars Hill" by Romans) is just outside the main exit of the Acropolis, before you enter the Ancient forum (its #17 on the map) -- A huge shiny ROCK, fun to climb if you have rubber soles; be careful not to slide down on your behind!!
• For Philapappos Hill, walk WEST of Acropolis along the delightful pedestrianized promenade called Dionysu AreoSomthing .... & turn S & up the hill. BTW, there have been some isolated reports of muggings here, for people going up that path alone... lots of shrubbery etc; best to do it in company.
• A better choice in my opnion is the PNYX... which is on the same promenade, but a bit further along = #17 on map for some reason spelled as PNIKA... an easy slope up to a flat area, with a Famous Platform; https://en.wikipedia.org/wiki/Pnyx -- this was where the Ancient democratic assemblies would meet. and on the platform y ou can stand where Pericles, Aristides and Demosthenes & other famous orators spoke. To me, much more of a thrill than Philapappos, named for a roman ruler after the Golden Age of Greece was past. PLUS -- Pynx is a GREAT perspective for photos of the Parthenon -- google "image" to see.