Tips on Customizing Visitor Maps and Who's Online

How to Hide Visitor Maps and Who's Online Admin Menus

function plt_hide_visitor_maps_menus() {
	//Hide the "Settings → Visitor Maps" menu.
	remove_submenu_page('options-general.php', 'visitor-maps/visitor-maps.php');

	//Hide the "Dashboard → Who's Online" menu.
	remove_submenu_page('index.php', 'visitor-maps');
	//Hide the "Dashboard → Who's Been Online" menu.
	remove_submenu_page('index.php', 'whos-been-online');
}

add_action('admin_menu', 'plt_hide_visitor_maps_menus', 11);

Where do I put this code?

How to Hide the "Visitor Maps - Who's Online" Dashboard Widget

function plt_hide_visitor_maps_dashboard_widgets() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Remove the "Visitor Maps - Who's Online" widget.
	remove_meta_box('visitor_maps_dashboard_widget', 'dashboard', 'normal');
}

add_action('wp_dashboard_setup', 'plt_hide_visitor_maps_dashboard_widgets', 20);