I’d call into Stif in Summerbridge and see what they recommend. I walked from Summerbridge up to Brimham Rocks, along to Pateley Bridge (via the Panorama), then up past the folly onto the moor, along Abraham crags? and back down through Dacre Banks to Summerbridge on Sunday. Most of it would be cheeky on a mountain bike, but there is some fun to be had there if you were up early enough…
Further up the valley is some good riding and even some nice singletrack if I remember rightly. On the lower route from Scar House to Lofthouse…
Ramsgill descent is supposed to be good. There was an old NPS DH track up there (remember Steve Peat pre-jumping the ski jump on the first race I ever watched up there), but I think it is off limits.
I will check out what the lads at Cycopath have built up at Gouthwaite farm this summer too.