I run to St Pauls from Peckham (Lyndhurst Way). So thinking about a route in reverse, I would head over the wobbly bridge, down the Thames path to city hall and then cut down towards the Bricklayers flyover on the Old Kent road (there are good backroutes avoiding the main road) You can then go under the underpass and make your way to Burgess Park (either down OKR or through the backstreets). When the park is open you could head across it, either to Surrey Canal Path or Benhill road. You can do this at the moment by going around the park. Depends if you're heading to Goose Green or Denmark Hill. So if the former all the way up Bellenden from the end of Surrey Canal to Goose Green. If the latter, you can give your glutes some hammer going up Camberwell Grove which has a good surface and on the right hand side no roads to cross until you get to the top. Down champion Hill to the cycle path to JAGs if you live at that end of ED or across to the top of Denmark Hill. Not traffic or people free, but a lot less grim than the elephant and Walworth.