Ummm, how well is the unit staffed?
Do they have upto date equipment?
How are the relationships with the docs?
Are there any "eat your young" on the unit?
If I build up vacation time is there any trouble about actually taking the time off?
What's the experience level of my coworkers?
What are my resources if my patient goes sour in the middle of the night?
How many staff actually go to the staff meetings? (A good indication of whether staff get to have input in decisions)
Get good answers to these questions, and after all that I might have a vague interest in perks like a cabin.