Paradise

Paradise is THE CORNER IS DEAD OPS!!!!! a location talked about in Call of the Dead. Players can overhear a conversation between Tank Dempsey, Nikolai Belinski, and Doctor Richtofen. Its existence is confirmed by two trophies/achievements that reward the player for sending them to Paradise in both solo and co-op. Not much else is known at this time. The player can frequently hear three of them conversing and giving instructions, though Takeo is incapacitated, and repeatedly throwing up (it is also possible that Nikolai is constantly throwing up as he's presumably a bit drunk, although Richtofen's last line "Well that's what you get for eating raw fish!" hints that this is Takeo, refering to sushi, a Japanese food).

Location
The Paradise is most likely going to be in a jungle (possibly referring to the cut map found in game files, Temple or possibly a building in a jungle, because there is glass in the wall of the building); as a Fern plant shown in the cut out corner is a common species of plant in tropical rainforests and jungles. As you can see in the loading screen of Call of the Dead, there is in the right-top a little piece of paper ripped off, leading to the next page of the book.

Achievements/Trophies

 * "Ensemble Cast" - In Call of the Dead, send the crew to Paradise in co-op.
 * "Stand-in" - In Call of the Dead, send the crew to Paradise in solo or co-op.

you might get both achievements in co-op mode. (althought it is not confirmed)