There's not much happening in Summertown, unless you mean the town end, just a shitload of expensive houses and Peter Hitchens, enough to put anyone off
Walking the canal is nice, and just south of Headington is Shotover country park, loads of wildlife etc. I was back and forth Oxford for 2 years. It's alright, first time i heard the phrase'Townie or Gownie' The A420 in to Oxford is great if you want to play road kill bingo, never have i seen so many dead Rabbits, Deer, Pheasants, Badgers etc. Probably shot by the locals