Unfortunately the weather was much too hot! (Not that there was anything you could do about it, but it certainly impacted everyone's experience).
One suggestion: Have some sports drinks onboard the boat to help rehydrate everyone when the weather is so hot. We actively looked for Powerade (or a similar drink) when we had free time, but were never able to locate any. Also, considering the average age of the folks on our tour, whenever there is a riding break in a town, you consistently need to recommend the location of a convenient, clean lavatory.
Overall, the food and tour guides were wonderful.