When? Whenever for me unless there is snow or ice on the ground (not good for two wheeled transport :o ).
How long? I think a weekend to start, Perhaps Sat morn to Sun eve so 1 overnighter.
To do what? During the day we shall be mostly exposing chemicals to light and the evening shall be mostly spent exposing our bodies to chemicals and good food.
Where? The toughie. Fairness says Birmingham, but i personally am with Leon on the seascape/rock thing with a few ruins and cemeteries thrown in for luck.

Just as a thought, we could try and tie in something with Cheryl when she comes over, she mentioned possibly February.