In reply to The Fox:
Eskdale is lovely, and often very quiet.
Wasdale Head can be busier, but also very atmospheric, and valley level walks from the Head can get you right inbetween the big fells. Or up to Sty Head Tarn if that's within acceptable length. The Screes along the back side of Wast Water aren't as easy as they look (path involves boulder hopping, so whilst it's "flat" you need to be good on your feet) but another possibility.
Muncaster Fell itself, and the surrounding area might be good, too.