Go on a Mission
Spread out, and communicate only through the walkie talkies.
There’s a good chance that unless you’ve done this a few times, something will go wrong. Develop a plan to get back to each other if you lose communication. This is sure to come in handy in case you ever lose each other in public or the woods.
It will get their mind right in case of an emergency, and they'll feel like spies or heroes or wherever their mind goes.