What I did on a similar trip:
685 Greenhead to Carlisle
104 Carlisle to Penrith
X4 Penrith to Keswick
77 Keswick to Keswick via Buttermere (absolutely mindblowing journey!)
554 Keswick to Carlisle via Wigton
685 Carlisle to Greenhead.
Filled the day in nicely!
RE: Non-Bus Related Days Out!