My favourite activity is pot holing. It’s dark and nobody can see anything. It is also really wet and you have to work as a team to navigate your way through the tunnels to find the start again. I like this activity because people easily get lost, and if you have not torch you would have no change of finding anything, including the rest of your team.
One time I went pot holing we searched for glowsticks in the dark. It builds your team skills and helps you to get to know your patrol. You have to squeeze through tight spaces and some of them are not at ground level which makes it harder and more interesting because some of your team struggle to get through.