Well back in my student days I used to love the Great Langdale site – largely because of the proximity of the Old Dungeon Ghyll, Raven Crag, Gimmer, etc. It was always a bit rowdy but with with several pints down my neck on a Friday night that didn’t seem too much of a concern.
Sadly I find now I can’t cope easily with the noise on most of the major campsites. Owners do little more than pay lip service to “rules” concerning disturbance to others.
Still, grumpiness apart, Langdale is still a great spot. Turner Hall Farm in Duddon brings back great memories, though when I last went it was basically a tap in a field. I don’t know how it is now. The location is brilliant, it’s fairly quiet (because there is no lake perhaps?) and the pub in Seathwaite is good. Excellent access to Harter fell, Coniston fells, Eskdale (park at Cockley Beck for a brilliant ascent of Scafell Pike up Little Narrowcove).
I understand there are also very good sites at Boot in Eskdale and over at Patterdale (Ullswater), Side Farm. Brother’s Water used to be pretty good too.