CPT UI + Advanced Custom Fields + Front-end data collection form. Visit blog post https://bit.ly/2KwpDWK

add-restaurant.php

<?php
/**
 * Template Name: Add Restaurant
 * Template Post Type: page
 *
 * @package WordPress
 * @subpackage Twenty_Twenty
 * @since Twenty Twenty 1.0
 */

acf_form_head();
get_header();
?>

<main id="site-content" role="main">
  <div class="page type-page status-publish hentry">
    <div class="post-inner thin">
      <div class="entry-content"> 
        <?php
          if (have_posts()) {
            while (have_posts()) {
              the_post();
              acf_form(array(
                'id'       => 4, 
                'post_id'  => 'new_post',
                'new_post' => array(
                  'post_type'   => 'restaurants',
                  'post_status' => 'draft',
                ), 
                'uploader'     => 'basic', 
                'submit_value' => 'Submit Your Restaurant &rarr;',
              ));
            }
          }
        ?>
      </div>
    </div>
  </div>
</main> 

<?php
acf_enqueue_uploader();
get_footer();