I went on this tour last week, and I couldn't be happier with my experience. Mel was our guide, and she was incredible! We started at 9 am and ended close to 6 pm with the pickup and drop-off conveniently at Union Station. If you take this tour, you'll get to see a lot more than you would if you decided to venture into the park yourself. For the price and the amount of time you spend, it's well worth it. Don't be afraid to ask questions too, the guides are very knowledgeable and love to share what they know with you. Mel did a great job making sure we saw a lot of the park and took us to some really beautiful places. Lunch was provided which was delicious, and the guides also provide plenty of water which was a plus! I highly recommend touring with this group, as they are very professional and strive to give you the best experience they can offer.