If Elseif Query

This cannot work.
It has to look like the following (or similar):

<?php
if (get_post_meta($post->ID, 'TourURL', true)) {
    ?>
    <div class="tourenquiryonline">
        <h2>Book or Inquire</h2>
        This tour can be booked online.
    </div>
    <?php
} elseif (get_post_meta($post->ID, 'bhid', true)) {
    ?>
    <div class="tourenquiryonline">
        <h2>Book</h2>
        This tour can be booked online via the form on the right hand side of this page.
    </div>
    <?php
} else {
    ?>
    <div class="tourenquiry">
        <div id="wufoo-q7x2x3">
        Fill out my <a href="http://touristisrael.wufoo.com/forms/q7x2x3">online form</a>.
        </div>
    <?php
}
?>

// Edit
And as you can see, you are missing a closing </div> in the else case.