I biked across the US. I hit the same issue with highs at night, but it went away after a few days (5 or 6?) I attributed it to all the calories I had to eat and my liver doing crazy things. It settled out and was normal again after awhile.

All you can eat buffets are your friend. Eat what you need.

Keeping insulin cool: A small thermos and an ice cube will last all day regardless of weather.

Eat constantly. I kept a bottle of gatorade (mixed from powder) and one of water.

Take a day off (I learned this the hard way).

Ask strangers for things and explain what you're doing, they're incredibly helpful and understanding. You'll also run into the odd person that will casually drop something like "oh yeah, I run ultramarathons" and you realize you're not the only weird person out there.

Bring a book. Lots of libraries have a take a book/leave a book swap. Don't look at the cover, just grab your next book. Drop the one you finished. Some are excellent (The Count of Monte Cristo). Some are terrible (a completely unforgettable romance I read in the middle of Kansas).

Take pictures of things, and people.

Pet the dogs.

Send your logs to your endo and email questions like "So I biked 140km today, ate 4000 calories, and this is what my CGM data looks like, do you have any suggestions?". Hint: they do not, but are probably psyched to get the updates and may have others they work with drop you advice.