No database tables created after instalation

Hello am trying to create a WP- Plugin that has up to 4 different database tables, the problem i have is that it says that plugin is activated but when i search the phpmyadmin i dont see the tables created at my database.
Here is the code i am using

<?php
/*
	Plugin Name: Reservations
	Version: 0.1
	Plugin URI: www.google.com
	Description: Lets you choose reservations dates when available,set which days are unavalaible,minimun days to book, you can set different prices related to object of booking and/or date booked.
	Set prices by range dates (seasons) giving them a diferent background color + leyenda
	Pre-pay selected days (completely/or by fianza)
	Author: Javier Mo?±iz
	Author URI: https://javiermoniz.www.remarpro.com

    Copyright 2009  Javier Mo?iz Juliá  (email : see web contact)
    Licence:
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

	FUNCION DE INSTALACIóN SOLO SE ACTIVA SI EL PLUGIN NO ESTA ACTIVO
*/
   register_activation_hook('wp-content/plugins/reservations/reservations.php', 'reservations_install');

	//register_activation_hook(__FILE__,'reservations_install');
	register_deactivation_hook('wp-content/plugins/reservations/reservations.php','reservations_deactivate');
	$reservations_db_version = "1.0";

function reservations_install (){
   global $wpdb;
   global $reservations_db_version;

   // Creo la tabla temporada si no existe ya
   // esta tabla contiene las fechas de inicio y fin de las temporadas
   $table_name = $wpdb->prefix . "temporada";
   var_dump($table_name);
   if($wpdb->get_var("show tables like '$table_name'") != $table_name)
	   {
			$sql = "CREATE TABLE $table_name (
			id_temporada mediumint(9) NOT NULL AUTO_INCREMENT,
			nombre_temporada varchar(64) NOT NULL,
			fecha_ini timestamp NOT NULL,
			fecha_fin timestamp NOT NULL,
			uso_tarifa mediumint(9),
			UNIQUE KEY id (id_temporada)
			);";
			dbDelta($sql);
	   }

//   // Creo la tabla tarifas si no existe ya
	$table_name = $wpdb->prefix . "tarifas";
	if($wpdb->get_var("show tables like '$table_name'") != $table_name)
	{
			$sql = "CREATE TABLE $table_name (
			id_tarifa mediumint(9) NOT NULL AUTO_INCREMENT,
			nombre_tarifa varchar(64) NOT NULL,
			precio_tarifa int,
			fecha_ini timestamp NOT NULL,
			fecha_fin timestamp NOT NULL,
			UNIQUE KEY id (id_tarifa)
			);";
			dbDelta($sql);
    }
//
//	// Creo la tabla reservas si no existe ya
    $table_name = $wpdb->prefix . "reservas";
	if($wpdb->get_var("show tables like '$table_name'") != $table_name)
	{
			$sql = "CREATE TABLE $table_name (
			id_reserva mediumint(9) NOT NULL AUTO_INCREMENT,
			nombre_cliente varchar(64) NOT NULL,
			email_cliente varchar(64) NOT NULL,
			pagado_parcial int,
			pagado_total int,
			fecha_ini_reserva timestamp NOT NULL,
			fecha_fin_reserva timestamp NOT NULL,
			UNIQUE KEY id (id_reserva)
			);";
			dbDelta($sql);
	}
//
//	// Creo la tabla vinculos si no existe ya
	$table_name = $wpdb->prefix . "vinculos";
    if($wpdb->get_var("show tables like '$table_name'") != $table_name)
    {
		$sql = " CREATE TABLE $table_name (
		id_vinculo mediumint(9) NOT NULL AUTO_INCREMENT,
		id_reserva mediumint(9) NOT NULL,
		id_temporada mediumint(9) NOT NULL,
		id_tarifa mediumint(9) NOT NULL,
		UNIQUE KEY id (id_vinculo)
		);";
		dbDelta($sql);
    }
}	  

//	// registrar la función que se ejecuta al desactivar el plugin

//
//// función que se ejecuta al desactivar el plugin
function reservations_deactivate()
{
//    // borrar las tablas del plugin
    global $wpdb;
    $table_name = $wpdb->prefix."reservations,";
    $table_name.= $wpdb->prefix . "temporada,";
    $table_name.= $wpdb->prefix . "tarifas,";
    $table_name.= $wpdb->prefix . "reservas,";
    $table_name.= $wpdb->prefix . "vinculos";
    $sql = "DROP TABLE $table_name";
    $wpdb->query($sql);
//
//    // borrar la option del plugin
    delete_option(’reservations_saludo_type’);
}
?>