We booked our Trek a few months in advance of our tour (opening day for taking reservations, I forget what it was as it was 2 years ago). We booked the first tour of the day because we've been told that is when the animals are the most active. I don't know how quickly they book up but our tour was full. I highly recommend it. It's pricey, for sure, but the individualized attention you get was astounding. The pictures that they took (included in the price) were GREAT! It was soooo much fun. Food was good, too. We're considering doing it again. Call and find out what their availability is. At least if you do that you'll know off the bat if participating is even an option for you.
