Regarding your last point, it's always a good idea to bring a compact power strip with you when travelling. Something like this or this, though you may need a 3-prong to 2-prong converter for some places in Japan. They are great for nights when you have to charge multiple devices and make you a hero at airports.
Are cruises not allowing surge protectors nowadays? As early as last year I was able to bring a surge protector. Specifically, this one: https://www.amazon.com/dp/B00ATZJ5YS/ref=twister_B00E63ENTQ
Most of amazon's debate merch and stickers are trash. Use redbubble for merch and stickers, here is what I would buy on amazon:
Debate related:
Actually nice looking table-tote / lapdesk
THIS WILL SAVE YOUR LIFE AT TOURNAMENTS
These will save your eyes during the late nights spent prepping
Slim wallet to travel light at tournaments
Keeps your shirt collars and pits looking mighty fresh
Other quality purchases:
If you don't own a portable speaker get this one
Something about this really calls me
Saved me in a few small airports. Mini Travel Swivel Charger Surge Protector with Dual USB Ports
http://www.amazon.com/Belkin-SurgePlus-3-Outlet-Charger-Protector/dp/B00ATZJ5YS
Said this before but if you are at a hostel extra chargers, iPhone and android wires and this bad boy ( https://www.amazon.com/dp/B00ATZJ5YS/ ) can make you best of friends with your hostel mates.