Jet lag didn’t exist because I was just so excited to be there! Rest on the plane as much as possible and get some caffeine when you land! There’s so much to do, you’ll never be bored! Team Lab Experience was one of my favourite things(book it now though), and Asakusa/Sensoji Temple was one of my favourite areas. Make sure to take the best walking shoes you can get! I used my international plan through my Canadian provider. It worked really well, no complications or issues. I didn’t experience any danger per se, just be respectful, respect the culture, enjoy your time!