The Delaware beaches are beautiful. Clean, wide open and sparsely visited this time of year. We were concerned that access would be adversely effected by hurricane Sandy, but saw no evidence of damage or major disruption until we traveled further south near Indian River. Even there the sand had been moved off the road and visitors were walking the shore.
We enjoyed a very mild day for Nov with temps in the low 60's, but be prepared for any weather when visiting in late Fall, Winter or early Spring. When you get hungry, thirsty, etc... head north or south to one of the communities that all seem to be open year round.
If you just want a place to walk along the ocean and de-stress the Delaware state beaches are a great choice.