Not the OP, but on my recent trip, I used Apple Books. The big advantage for me was that I could visit travel websites with lists of things to do, save website

Not the OP, but on my recent trip, I used Apple Books. The big advantage for me was that I could visit travel websites with lists of things to do, save website as PDF, made annotations of places I wanted to visit. It synced seamlessly across all my devices along with annotations. I annotated on my iPad at the hotel, and traveled with my iPhone.