I know nothing has been made conrete yet about the safari zone, as Mr_Dark reiterated multiple times, but I think the idea of two safari zones by ghostman50 was excellent.  One safari zone could be on the mainland where it was just like the standard RBY/RSE safari zone where your only weapons are your rocks and your treats.  This safari zone should contain very rare pokemon only catchable here or maybe just have it earlier in the game, making these rare pokemon catchable later in the game in the wild.  The safari island however, could be an island like ghostman50 said with all of his details.  Some things I would like to add on though include maybe it requires a special item like a card key to access and different parts may only be accessible by different leveled trainers.  You would be able to bring your pokemon in it, catching the island pokemon just like you would anyother but these pokemon would be a tad bit more difficult to beat and much more difficult to catch.  Just a thought....