This is similar to another thread on here about working for free.
With lots of time on my hands I applied to volunteer as a local heritage site where I help out in the creative dept. This is work I used to do when I had a life/real job, so know a bit about it all. I effectively do a chunk of my boss's job, for which he is well paid. He then is free to go off on fact-finding missions, training days and junkets.
I quite enjoy the work but do feel under-valued and a bit invisible as a volunteer doing work for which he is paid ifyswim. I am the only volunteer in the dept and everyone else gets a good salary and holidays etc plus they don't seem to do very much! Are they taking the micky?