Wow! so Many ideas...
Ok, I'm not too sure what will go in there. I can start with what will NOT go in there: all the c - rap that doesn't get put away somewhere else. The bills and paperwork and files of daily living, piles of off-season clothing, oddball furniture...all starting to pile up in there.
And, if I start putting things like sewing machine, dremel station, file cabinets, computer - it becomes a work room and not, as a man cave is, a place of relaxing and removal from the daily grind of responsibility. I sure could use a dedicated work room/craft room though!
Zen Den? Lady Lair?
The problem is, after 20 years of all males - DH, boys, boy scouts, a job in a male dominated career, more college, etc... - I don't know WHAT to do just for myself. Seriously. Um, I could put some plants and a meditation mat. A little cd player with headphones for MY music (which I have found lately, and is not what the rest listen to - particularly at the volume I find needed). A really comfy chair and bookcases.
Like the Man Cave, it will double duty a fold out futon bed. We did agree the Man Cave would not be a storage area except for the man's album/music collection (over 2,000 albums - was afraid the ceiling would come down) and a light free weight set, the tv and supporting equipment. And, the beer frig.
As far as a shop - that is half the garage, which we ALL use often.
Hmmm.
The ideas you all have are great! Thank you