Start with a mirror and ask how you define happiness and how current department behavior is lacking. How will you measure success given that most HR policies frown on everyone hugging and kissing in the hallways? 

You can look at the task as an attempt to correct problems or as an opportunity to augment things that are already good. So why would anyone ever work in your department, or do people apply because it was better than unemployment?

The corporate-university model is not what most of the faculty signed up for when they started school. It got worse when budgets shrank and they now have to buy office supplies, pay parking, and cover utilities. It got worse when their benefits were "renegotiated" to give them less or make them work longer or remove tenure entirely. It got worse as lab space shrank to make room for new faculty members. It got worse when budget restrictions were imposed. It also got worse as HR rolls out yet another new portal that seems to do nothing more than suck time and hide services. Sometimes HR likes the new system, but everyone else not so much.