If I took a trip to Kielder… and rode the man made stuff there, how could I make it a three day trip ? what else is good to ride in the area, natural or man made ?

Cheers.

Newcastleton &Stanes trail, you can join the 2 for a big ride. Up the road is Glentress. Down the road you will be passing the Howgills.
Cross Fell and the Calf/Bowderdale.
You are a couple of hrs away from Ae/Mabie/Dalbeattie/Drumlanrig.
Across the fells there are routes around Hawes/Dent/Reeth and the villages around that area.

cheers trekster