Rob Gronkowski -- Sailing to 'Gronk Island' ... For Insane Party Cruise

Finally! New details on Rob Gronkowski's upcoming mega-booze cruise ... and it involves Waka Flocka Flame, a "big ass ship," and something called "Gronk Island."

Who's ready to get Gronk'd?!?!

The New England Patriots superstar just released a brand new pump-up video for "Gronk's Party Ship" -- a 3-day cruise from Miami to The Bahamas in February ... and it's everything you'd expect.

Beers.
Glow sticks.
Air horns.
Hot chicks in bikinis.
Red Solo cups.
Hula hoops.
Inflatable animals.
Waka Flocka Flame.

By the way, the ship will have 13 BARS, a spa, hot tubs, gym and a casino for all 2,500 passengers ... who each get a photo with Gronk as part of the package.

Plus, there's this challenge from Gronk's cruise team -- "If this doesn't sound Gronk'd enough for you, then you're not ready to party with the big dogs."