We did the tour last June and we just walked up to the counter without any reservations and got right in to the next tour. We had our DS9 with us and he liked most of the tour but he did start to get antsy and bored towards the end. IMAO, I probably wouldn't take young children on the tour as it doesn't really have anything to keep them entertained, as the tour basically deals with the science behind the different growing methods used in their gardens. And if you need strollers for little ones I am not even sure they would be allowed in the greenhouses, as one lady in a wheelchair on our tour had to skip certain parts due to not being able to use her chair.