The tour guide was just guiding us up and down the boat with no information provided during our tour in the cave. He walked through the cave quickly without stopping for explanation or photo taking, so most people eventually chose to stay behind and take pictures instead of following him.
After the boat tour, he took us to a restaurant for "beef noodles" which was not of good quality and the waitress charged us a higher price than stated in the menu. Her explanation was that price in the menu was for a smaller bowl of noddles but we didn't see any difference in sizes with orders from nearby tables.