Dubai
It's the craziest place in the whole wide world! They could get stranded on the top of a ridiculous construction site, mixed up with human traffickers, buy somebody's opium fields, become the heads of Exxon, and wake up in their hotel room with fireworks strapped to their asses on a timer.

Oktoberfest
This was already done hilariously in Beerfest, but if anyone can top that crazy ass movie it's the Hangover guys. There won't be a tent left standing or a dirndl-donned fräulein left un-molested. Plus, so much mysterious sauerkraut vomit everywhere.

Carnaval
They wake up with a Brazilian gangster's samba float in their hotel room and at the end there's a photo of Alan in a thong and fanny pack riding it down the parade route. They fight the Rio mafia, Phil discovers he faked his way into the priesthood just in time for Lent, and Stu meets the (still) topless showgirl he married last night. Then they hit Ipanema for Doug's second wedding!

Ibiza
Home to house music, the largest club in the world, lots of sweaty Europeans and dozens of varieties of ecstasy, Ibiza is like a bigger, less-clothed, more insane Vegas. Among other things, they could steal Tiesto's turntables and stuff Moby in somebody's trunk, prompting the nice drunk people of Ibiza to name them island heroes.

Tijuana
Five words: Alan does a donkey show.

Comic Con
They wake up with Bruce Campbell singing a Steve Winwood song in their room, a Jar Jar Binks gets murdered, Captain Kirk's chair is stolen, and they beat the crap out of Seth McFarlane with the penguins they stole from the San Diego Zoo. Everybody wins.

Disneyworld
Alan fights a Mickey Mouse when he calls him a ritard, they spend a good deal of time terrorizing Midwestern families, do us all a favor and blow up boring Epcot, and steal some animatronic people from Small World. If Vegas is the perfect place to have a bachelor party, Disneyworld is hands down the absolute least appropriate place, which is why they should do it.

Honorable mention goes to Amsterdam, a lovely city with hardly any laws and copious amounts of hookers, booze and weed, but I think the internet needs another tribute to Amsterdam like a hole in the head. And as for Mardi Gras, New Orleans has been through enough without these four tearing through it, hasn't it?

Other ideas, my Carmen Sandiegos? Leave 'em in the comments!