This is a treasure hunt that is exciting but needs to be well executed. I did this for six of my summer camps for kids around 5-10 and they just loved it. Basically all the clues can be found on a common playground but this would not be advisable with no playground. Plus, you may have to edit this to adjust to your own playground.
This will be great, if you read it over and get everything planned at least a couple of days in advance, but this is not one of those "Hail Mary's". But, with a little effort, this activity is well worth it.