I am not too sure about the road conditions either. But 500+kms. would really be boring, trust me. More so, because it is plains. Why don't you ride to some hills, instead? Since you are in one of the 'meccas' of North (Delhi) from where every hilly region is pretty close.
Try going to Lansdowne, Dhanaulti, Kasauli, Mc.LeodGanj, Kufri, Fagu, Narkanda or any other place..
