Get Taxonomy term using wp_query

Hi,
i have a custom post type called tours with taxonomy called tourtypes and few terms i.e casual, adventure. My theme also have the option to choose how many items to be displayed on a page.

The following code to query on the post type and no of item to be displayed. What i couldnt figure out is how to display the specific term that user choose from the menu

$paged = get_query_string_paged();
$counter = 1;
$terms = (get_query_var('terms')) ? get_query_var('terms') : 1;

$posts_per_page = get_option('theme_show_tour_items');
    if($posts_per_page == "") {
       $posts_per_page = get_option('posts_per_page');
				}
$my_query = new WP_Query(array('post_type' => 'tours',  'tourtypes' => $terms, 'paged' => $paged, 'posts_per_page' => $posts_per_page));

if ( $my_query->have_posts() ) : while ( $my_query->have_posts() ) : $my_query->the_post(); ?>
...