I was watching a movie and it made me think about your secret agent themed park thing. Some scenarios.
THE MARK: One guy, the mark, starts from one corner of the park and must move about the park and only the park, for X amount of time. All others are trying to find this guy and take him out. If they, the hunters, come across one another they can kill eachother. This can be either permanant elimination, or everyone but the mark can have respawn by XX second count or by going to the "rendezvous" point where they can respawn.
TEAM KILL: Same as the mark except all groups are teams of three even the Mark is a team of three.
POT OF GOLD: You hide a treasure or an object or something, anything, in the park. Put a GM/herald somewhere near the site to protect the treasure from being taken by someone not in the game. Divide into individuals or into teams of three. Put a time limit. Agents have to find the treasure in that amount of time. Agents can kill other agents but they respond in XX amount of time or at a respawn point for each team. The object can be:
a) The first agent/team that finds the treasure automaticly wins and ends the game.
b) Whomever finds the treasure must bring it back to the respawn or a predetermined goal point and then wins the game.
c) Whomever finds the treasure must keep it in their possession til the time limit expires in order to win the game. Whoever has possession once the time limit expires wins. If someone dies while holding the object, they must drop it at that spot. They can not respawn with it.
CLUE HUNT: As in Pot o' gold, divide into individual agents or teams of agents. The GM will set up a bunch of clues throughout the park. Each agent/team is given one clue to start with. The clues must be deciphered in some way and should hint to the location of another clue. All clues, once found and deciphered, should then be another clue that needs to be deciphered to find the treasure/object. Once the treasure is found it must be brought back to a respawn/goal place for the agent/team to win. No time limit.
You could DAGORHIRIFY These games by making them agents or teams of factions within Barad'Dun. King's Militia, Warlord thugs, or Dragon Cult, etc, etc, etc. They could be armed with Single blues and when they meet, normal Dagorhir combat would result. However, they should make an attempt to conceal their weapons or camouflage them to the general public and other players to keep secretive.
Konradr