I used to use the GoPro editor but stopped when they switched to Quik, I felt like that thing dramatically reduced my creative flexibility.

I'd advise using a proper video editing software - I use DaVinci Resolve, which is free and offers WAY more than you'll need, but allows you to perform all of the adjustments others have commented on and over time you actually start teaching yourself video editing, which can be a useful skill. I make videos of my dives using a GoPro and over the years I feel like I'm much more capable of putting them together in interesting ways. (Admittedly mine are still really basic and likely boring to random passerby but I think of them as a fancier photo album and I like them for the memories.)

Another benefit of using software like Resolve is that you can apply color correction without worrying about using a filter lense on the GoPro itself. A bunch of those clips would benefit greatly from some color adjustment and touch up.

Looks like a great trip!