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<script>
    // Get the element with id="defaultOpen" and click on it
    document.getElementById("defaultOpen").click();

    function openCity(evt, cityName) {
      // Declare all variables
      var i, tabcontent, tablinks;

      // Get all elements with class="tabcontent" and hide them
      tabcontent = document.getElementsByClassName("tabcontent");
      for (i = 0; i < tabcontent.length; i++) {
          tabcontent[i].style.display = "none";
      }

      // Get all elements with class="tablinks" and remove the class "active"
      tablinks = document.getElementsByClassName("tablinks");
      for (i = 0; i < tablinks.length; i++) {
          tablinks[i].className = tablinks[i].className.replace(" active", "");
      }

      // Show the current tab, and add an "active" class to the button that opened the tab
      document.getElementById(cityName).style.display = "block";
      evt.currentTarget.className += " active";
    }

    // Get the element with id="defaultOpen" and click on it
    document.getElementById("defaultOpen").click();
</script>

HTML
<div class="tab">
						  <button class="tablinks" id="defaultOpen" onclick="openCity(event, 'undergraduate')">MOUNTAIN STATS</button>
						  <button class="tablinks" onclick="openCity(event, 'advanced')">OUR TRAILS</button>
			        	<div class="tile-container inliner">

			        		<div id="undergraduate" class="tabcontent">
				        		<div class="main-tile contact-tile">
				        			<div class="main-content">
				        				<div class="row">
				        					<p>TOTAL PATROLLED AREA</p>
				        					<p class="little-text"><?php the_field('stats-patrolled_area') ?></p>
				        				</div>
				        				<div class="row">
				        					<p>VERTICAL DROP</p>
				        					<p class="little-text"><?php the_field('stats-vertical_drop') ?></p>
				        				</div>
				        				<div class="row">
				        					<p>SUMMIT ELEVATION</p>
				        					<p class="little-text"><?php the_field('stats-summit_elevation') ?></p>
				        				</div>
				        				<div class="row">
				        					<p>LONGEST RUN</p>
				        					<p class="little-text"><?php the_field('stats-longest_run') ?></p>
				        				</div>
				        				<div class="row">
				        					<p>SNOWMAKING</p>
				        					<p class="little-text"><?php the_field('stats-snowmaking') ?></p>
				        				</div>
				        				<div class="row">
				        					<p>ANNUAL SNOWFALL</p>
				        					<p class="little-text"><?php the_field('stats-annual_snowfall') ?></p>
				        				</div>
				        			</div>
				        		</div>
				        	</div>

			        		<div id="advanced" class="tabcontent">
				        		<div class="main-tile contact-tile">
				        			<div class="main-content">
				        				<div class="row">
				        					<p>NUMBER OF TRAILS</p>
				        					<p class="little-text"><?php the_field('trails-number_of_trails') ?></p>
				        				</div>
				        				<div class="row">
				        					<p>BEGINNER</p>
				        					<p class="little-text"><?php the_field('trails-beginner') ?></p>
				        				</div>
				        				<div class="row">
				        					<p>INTERMEDIATE</p>
				        					<p class="little-text"><?php the_field('trails-intermediate') ?></p>
				        				</div>
				        				<div class="row">
				        					<p>ADVANCED</p>
				        					<p class="little-text"><?php the_field('trails-advanced') ?></p>
				        				</div>
				        				<div class="row">
				        					<p>EXPERT</p>
				        					<p class="little-text"><?php the_field('trails-expert') ?></p>
				        				</div>
				        				<div class="row">
				        					<p>LIFTS</p>
				        					<p class="little-text"><?php the_field('trails-lifts') ?></p>
				        				</div>
				        				<div class="row">
				        					<p>TERRAIN PARK</p>
				        					<p class="little-text"><?php the_field('trails-terrain_park') ?></p>
				        				</div>
				        				<div class="row">
				        					<p>CROSS COUNTRY</p>
				        					<p class="little-text"><?php the_field('trails-cross_country') ?></p>
				        				</div>
				        			</div>
				        		</div>
				        	</div>

			        	</div>
			        </div>
						</div>