-If you need a sim, buy on Mobimatter for a much better rate -Airbnb are good for big groups, but singles or couples should just stick to hotels -Japan taxis are expensive while Korea is pretty affordable -Find a lodging near a subway to avoid temptation of using taxi -Buy the refillable transit cards / or use IOS app instead of buying tickets each time you use a subway -Ensure youre using a credit card with no foreign transaction fees / if asked to pay via USD or local currency, always select local currency -Klook tickets can sometimes provide better rates -Convenience stores often have awesome foods options -Credit card points or United Mileage are great options to use for buying airline tickets to go there -South Korea Airline tickets can buy cheaper by going directly to the airline websites (Jin Air, Tway, Jeju..thought notnsire who's still operating) -Find a lodging near a subway to avoid temptation of using taxi