I’ve been to Japan at least 8 times, so I feel like I am pretty good at knowing what I need to do before I go. This video, “Must-Do Things Before Flying to Japan” has a number of useful tips, like how to book a good restaurant in advance, how to get a SIM card, how to book tickets to Disneyland, how to get a rail card, how to get a visa (most countries give you 90 days with no visa required), and which medications not to bring with you.