Want to get your staff looking at how they can make use of all parts of the school grounds? Set up a treasure hunt. In each location you want them to visit, ask them what the area could be used for and include a riddle for them to solve. Engage them in the process? Prizes for those who are first back, with the most correct riddle answers.
When we did this, we placed a QR Code in each location that linked to a Padlet wall. The staff entered their ideas onto the Padlet wall and we've been able to read the responses since.