One of the easiest, most efficient and least intrusive ways to get employee input is to set up a suggestion box. (You may want to use an electronic suggestion box if you have the capability to make it confidential) Make sure to:
promote it to employees both before and during the period it is set up
Ask for suggestions about Organizational culture, Healthy Lifestyle choices, Occupational Health and Safety.
emphasize that all suggestions within the bounds of what the workplace can offer will be considered seriously and confidentially
make the suggestion box attractive, visible and easily accessible
follow up on all the suggestions in some way — even if it’s just acknowledging them