Check out “100 Dives of a Lifetime: The World's Ultimate Underwater Destinations”
It is a National Geographic book with beautiful pictures and general descriptions. I wouldn’t call it a travel guide, but anyone can use it as a starting place to plan a trip.
It was a wonderful gift I received last year from a very thoughtful person.
I'd go with the fins that you have for comfort sake as long as you have the luggage space. I typically have had one large suitcase dedicated to dive gear because I like diving with my own fins, regs, and BCD.
They make a "shoe" wetsuit bootie if you want to spend the money on them, but if you have wetsuit boots, I'd just go with those.
Not a book on SCUBA but I always recommend DEEP by James Nestor. It's non-fiction and very easy to read.
Deep: Freediving, Renegade Science, and What the Ocean Tells Us About Ourselves link