I'm sure you're all keen to help with the practical task of looking after the park, so on Saturday you can join a working [1]. You'll have a choice of all sorts of activities, from planting [2] to picking up [3], so you'll be able to change from one to another when you feel like it. The rangers will be hard at work all day, but do come and join in, even for just a short while. One thing, though, is to make sure you're wearing something that you don't mind getting [4] or [5].