Vanessa,
Open door policies are great, if they are managed. I would suggest you set specific times for your "open door," this way you can provide devote dedicated time and attention to your employees. I agree with your statement on recognition, it's been demonstrated in multiple studies to have a positive impact on employee morale and performance. Setting expectations for high achievement is also important, along with coaching that identifies areas for enhancement and development; not "weaknesses". Having "fun" is an admirable goal, but that too must be managed to gain the maximum benefit for the organization as well as the employees. Remember its called "work" for a reason.
Dr. Robert Roehrich