The Howgills can be notoriously difficult to navigate in clag and it could be fairly orrible up on The Calf in the rain (brrrrr). --- but, if you walk up the steep path past Cautley Spout and keep following the beck past the fancy sheepfold, you'll hit a very good, clear path which runs from Sedbergh/Calders etc which, if you turn Right on will take you to the trig point in short order. To return to the beck with the sheepfold, either retrace your route (assuming its foggy) or walk on pretty much any bearing between East and North-East to get back to handrailing the beck.
If its clear(ish), there's a good bridleway heading NNE which goes to Bowderdale, but you turn E to hit the Bowderdale Head at Hare Shaw, which puts another reasonably good path underfoot to return to the Cross keys (they do fab sarsasparilla by the way - have some, its a real treat) Anyway, the longer option is only about six miles
If its not foggy, then your options open up quite a bit more - Great Dummacks, for instance The forecast for Sunday is dire, though, at the moment.
Pic of claggy trig point below. One of those eejits is me, and another is my dog!