[Larpus]

If you're down for key related games, a simple one is to take a rucksack that you can lock with a padlock (or any other bag for that can be locked) and take the key for it and put it into a bottle of water which you'll freeze prior to the dare in your freezer.

To get a nice even setting, you can dangle that key into the bottle with a thread to keep it kinda central.

To do the dare, go to a location/time of your choosing with the bottle, take off all your clothes and put them in the bag and lock it. Now you have to wait for that ice to melt (no fires)!

More fun can be had by stacking other tasks during the melting time.

The amount of ice (size of bottle) / how deep you bury the key determines how much risk you want to give yourself. This way you also never need to go to a specific place to retrieve the key, you'll always have it.... just not immediately usable.