Bike fit / correct riding position

Anything I can do about sore neck? Position is fine aside from the fact that keeping my head angled upwards so I can see gives me neck pain after a few hours.

Let me just pre-reject some "solutions":

• replace bike/cockpit - no
  
• stop looking where I'm going - no
  
• belay glasses - maybe
  
  

Really what I want is stretching and/or strengthening exercises or something