If you have a spare hour, do Barrow near Braithwaite, it's a class descent and a very short ride. Park Uzzicar, head up the old mining track towards Sail, head off right when you've got behind Barrow and climb up onto the top. Waz down then turn right when you get to the wall and follow the path back to the road and you'll be able to see your car up ahead.
The descents is very fast, bumpy, grass, with a few steep bits, absolute hoot! Note it'll only take an hour, so you've no excuse!
Dodd Wood below Skiddaw is ok too, fire road up to the top, then there's a footpath down.
Grisedale Pike down the wall or off Hobcarton into Whinlatter are both really good desecents, worth tagging onto the South Loop of the Altura trail.