I love parkour type of gamemodes in any game ( no one will know this probably, but there was an XBOX game out called Far Cry Predator: Instincts where you could make multiplayer maps yourself and host them, I would only join parkour maps, some maps could take up to 12 hours to complete xD ! ).
That's why I've gotta say the floor is lava is one of my favourite. I absolutely hate zombieland, alot of people like it but I don't see the fun in it

. Prop hunt seems pretty cool aswell, though never tried it out yet.