Lake Vostok

You like Antarctica, the planet's seventh and most remote continent.

You can still find antique maps that don't even show a continent where Antarctica lies. Most of it has still never heard a human voice, or even been traversed by a mammal. It's an empty, frozen desert, with the coldest temperatures and the highest average elevation on Earth. In short, it's the best place, period, to start up a massive, outdoor paintball facility.

The balls would sting like a bitch cuz they'd be frozen, the dye would show up really well on the snow, and the pack ice, ice shelves, icebergs and, well, ice, would provide ever-changing obstacles, trenches and defensive structures. You could even offer a high-roller version, where teams do HALO parachute jumps (http://en.wikipedia.org/wiki/HALO/HAHO) onto opposite sides of the continent and hunt each other down. That would fuckin' rock...until someone accidentally broke through the ice covering Lake Vostok (http://en.wikipedia.org/wiki/Lake_Vostok) and woke a slumbering sea demon with an insatiable appetite for human flesh. That might not fuckin' rock as much.