Random number help

#==============================================================================
# ** Random_Maps
#------------------------------------------------------------------------------
#  - Script will randomize maps for dungeons.
#==============================================================================

 class Random_Maps
   
   #=================
   # - Main
   #=================
   def Game_Event
   super
   initialize(MAP001, EV001)
     
     A = rand(2..4)
     
     case A
     
     when 2
       puts '$game_player.reserve_transfer(VILLAGE, 036, 023, up)'
     when 3
       puts '$game_player.reserve_transfer(MAP003, 008, 002, down)'
     when 4
       puts '$game_player.reserve_transfer(MAP004, 014, 004, down)'
     
   end
   
   #=========================
   # End of first random dungeon event
   #=========================

Hey!
Great to see your attempt. Can you tell me more about what you are trying to achieve? Unfortunately, it isn't readily apparent to me from the code.
But here are some recommendations to make your code follow Ruby standards better:
method names must be snakecase. Like this_is_a_snake_case. The letters are lower case and multiple words are separated by an underscore. So, def Game_Event becomes def game_events
Class names does not have underscores. Words are separated by upper case letters. Like so: class RandomMaps
only constants start with uppercase letters. Normal variable names must always be in snakecase. So, A = rand(2..4) should ideally be something like: move = rand(2..4)
008 is an invalid octal. In Ruby, if you start a number with 0, it assumes it is an octal (http://en.wikipedia.org/wiki/Octal). Octal can only have a range from 0-7. I'm assuming you haven't tried running this code - if you do, it would raise an error.
$game_player is not recommended. It is a global variable. Global variables means global state. A fundamental programming best practice is to avoid unbounded state as much as possible.
I've written an unconsidered snippet of code to try approaching your requirement. I'm trying to approximate your solution as much as possible. The details will be wrong, please bear with me!
class World

  # the intention of these constants are unclear to me. Giving them some arbitrary values.
  VILLAGE = "village"
  MAP003 = "map3"
  MAP004 =  "map4"

  UP = "direction-up"
  DOWN = "direction-down"

  attr_reader :map

  def initialize(map)
    @map = map
  end

  def new_turn
    move = rand(4)

    # I'm not quite sure what this signifies. We can work on this if you elaborate this part.
    case move
      when 2
        map.reserve_transfer(VILLAGE, 36, 23, UP)
      when 3
        map.reserve_transfer(MAP003, 8, 2, DOWN)
      when 4
        map.reserve_transfer(MAP004, 14, 4, DOWN)
    end
  end

end

class Map
  def initialize
  end

  def reserve_transfer(who, x, y, direction)
    puts "Transferred #{who} by #{x}, #{y} in #{direction}"
  end
end

world = World.new(Map.new)
world.new_turn
world.new_turn
world.new_turn
Try copy-pasting the above code to a Ruby file and run it. Or even better, go to http://rubymonk.com/learning/books/1/chapters/5-strings/lessons/31-string-basics, and paste this code in the first example. You can use RubyMonk itself to play around with this code!
Let me know what you think of this, also try to give me a detailed idea of you have in your mind. Hope this helps!