The Field Museum of Natural history is grand in every sense of the word. As a fossil preparator or collections volunteer no day was boring, you could work on anything you wanted as long as the projects were finished in a timely matter. I learned to create a better life work balance as I was a full time student during the week and commuting downtown over the weekend to volunteer and eventually decreased my hours. The management of volunteers is somewhat broken, they won't keep you on if you don't work for 10-15 hours a week, I had a two hour commute each way and came in as often as possible but could not meet their requirements and was treated rudely by a volunteer manager. Other than that isolated incident there really was no hard part to the job; everyone was supportive, passionate, and creative.
Ice breaker parties every week, The Brain Scoop is made here