From Card Player Caesars Entertainment Corp. and another firm are developing a zip line-like ride between the two towers of the Rio Hotel and Casino, according to the Las Vegas Review-Journal. The project is not expected to be done in time for the summer World Series of Poker, however. The project is being called the “Voodoo Skyline” and it will send guests flying 400 feet above the ground between the two sections of the massive casino. “It’s going to be different than a typical zip line,” one of the developers said. “This type of system is viewed as much safer…