where to cycle from Abbey Wood?
Anywhere!
If you get to Greenwich Pier you can take the foot tunnel under the thames and then follow the Thames path through the Isle of Dogs, Canary Wharf, Limehouse, Wapping, across Tower Bridge and then Shad Thames, Rotherhithe back to Greenwich.
You could also extend the route into central London.
Not sure if I’d want to cycle around Abbey Wood but I’m a middle class whiney cockbag.