I’ll have a look this evening. Message me tomorrow if I forget! I assume you are ok on minor roads. That will make it easier to link stuff. Are you happy to drive to the start? Means you can more interesting rides.
Waskerley way is a good option. Few cafes and big views.
There’s the Tynedale Railway.
You can ride along various bits of the Tyne. Not sure how far either side of Hexham but there is a bike path along Tyne green in the town.
Slaley forest (might be a swamp right now!)
There’s stuff near Walk, Bellingham.
Kielder is only up the road for a lap of the reservoir.
It might be more road biased but up by the Derwent reservoir.