I have been on this tour in the winter and the summer. I HIGHLY recommend taking this tour in the winter months.
Having taken the tour when the sun wasn't scorching, and when it was... you would be yourself a HUGE disservice by booking this tour in the summer.
It is an enjoyable experience either way, however, when you consider how much more you can enjoy the tour when you don't have to jockey for inches of available shade and few available seats at time when you do get to sit down.
Also, touring the backstage areas is so much more fun when you don't have to clear out of the way every minute for traffic clearance.
I suggest taking the very first tour time in the morning. You get in the park a little early, and you get to spend more of your day in the park after the tour.
The Keys To The Kingdom Tour covers 1 topic, how Disney does business. Courtesy, Safety, Show, and Efficiency. Those are the 4 Keys To The Kingdom.
That's the topic of the tour - everything that you see times back in to how those principles are applied from design, construction, staffing, emergencies, etc etc etc
If you are looking a more 'exhaust-ing/ive' backstage experience, I suggest the Backstage Magic Tour. You will get to see far more on the Backstage Magic Tour VS. the Keys To The Kingdom Tour. You will see how magic is made in all four parks, and MANY MANY MANY other areas.
We have done MANY Disney tours, and have enjoyed all of them.
Here are the ones I can remember we have done...
Behind The Seeds Tour (I suggest this for anyone with late elementary-late teens kids - it is a great short tour that gives you a few moments of behind the scenes time, it is a very affordable tour, and it makes you want to give gardening a try!)
Yuletide Magic
Keys To The Kingdom
Backstage Magic
Undiscovered Future World
Magic Behind Our Steam Trains
Marceline To The Magic Kingdom
Tours are an awesome way to dive a little deeper in to the magic!
