No girls are allowed in the vicinity.
This is like a honeymoon, only for 2 or more men having a boys night out day after day.
Consider it a bachelor party that continues for the length of a vacation.
Boys being boys for a week, and sharing the man-love.
2) Two brothers hanging out doing stuff they can't do with their girlfriends, or family or sisters around.
3) A bunch of high school or college or grad school buddies getting together on say a fishing trip, and shooting the breeze about life, complaining about their wives, jobs, etc., and just having a good time with a bunch of testosterone filled activities.