A software thing I do which has proven invaluable is create my itinerary in Apple Notes. Windows option may be OneNote? which also stores cloud-based cross-platform unformatted content well and I've found very flexible. I don't know about Android but I'm sure there's an option.
But if you have Apple gear, Notes is free and perfect for this. It will easily store most anything you drag into it or share to it. Photos, videos, screen prints, scans, documents, web links, formatted text, freestyle drawings (if you have an Apple Pencil), contact cards. Cloud based so I can work on it via iPad, phone or Mac wherever I am.
For any trip, work or play, I put all my info about duty free, local website links, things to do, itinerary, PDF docs of all bookings and flights, screen shots of maps (in case I was offline although you can save map references which take you to the Maps app), taxi fare estimates, notes for eateries to try near where we are for the day. Having literally
everything in a single cloud-based repository makes the lead-in planning unbelievably easier to manage and organise/re-organise as we re-think the itinerary and move stuff around. And gives me loads of time to confirm and be comfortable that we've got everything we need, before closing the door, and that it can't be lost during travels (all you need is an internet computer to get to your docs).
Lastly, and of most benefit, I can share the note with my partner so that we could both add/delete/organise information as we research the trip, and we can both see how it was coming along.
On the trip itself, photos of things I specifically want to make remember of could be added/saved to the note (I often use photos when it's too much to write). And short text of things I wanted to remember for next time (I'm not a travel diary person). If it's a conference, it gives me an excellent single repository for the entire conference - planning, travel, meetings, notes, session info, people (can store .vcf cards) which works well for me.
And then the whole caboodle is sitting on the iPhone everywhere we go. Really worked well. Just a tip - remember to right-click on attached files and say "view as small images".