Tokyo is gonna be wild but yeah, three days is a real crunch time to get this sorted. I've been using the a6000 series for years and honestly, the kit lens is such a letdown for vlogging. It makes everything feel claustrophobic and you miss half the cool stuff happening behind you. I actually wasted a lot of money on the Sigma 16mm f/1.4 DC DN Contemporary early on. People rave about it online but I was pretty disappointed with how heavy it is for travel. It's a total chunky brick and my arm would get so tired holding it out on a tripod. Plus, 16mm is still a bit tight on a crop sensor like yours... you dont get enough of the background in the shot when your arm is extended. Here are the ones I actually suggest looking at instead:

• Sigma 10-18mm f/2.8 DC DN Contemporary: This thing is tiny. I was shocked how small it is compared to the older lenses. It's way wider so you can actually see the Tokyo skyline behind your head. The f/2.8 is fast enough for night shots in Shinjuku too.
• Tamron 11-20mm f/2.8 Di III-A RXD: This is a solid alternative but unfortunately it's a bit larger and more expensive. I also had issues with the autofocus being a bit jumpy in low light which was super frustrating during a night shoot. It's not as good as I expected for the price tag tbh. Definitely try to grab the Sigma 10-18mm if you can find it in a shop before you fly. It solves the face-filling-the-screen problem and wont break your wrist while you're exploring the city.

Man, Tokyo is gonna be incredible! I remember my first trip there with a tight lens and I basically just filmed my own nose the whole time... super annoying. You definitely need something wider. My absolute favorite right now is the Sony E 11mm f/1.8. It is crazy wide, super sharp, and honestly weighs almost nothing. Walking around Shinjuku for ten hours was a breeze with this setup since it doesnt weigh you down. If you want something for those gorgeous night shots in Golden Gai, the Sigma 16mm f/1.4 DC DN Contemporary is a beast. The background blur is insane! But be warned, it is much bigger and heavier than the Sony. For vlogging, the Tamron 11-20mm f/2.8 Di III-A RXD is great when you need to zoom, but its a bit pricier. Seriously tho, just grab that 11mm and youll have the best time. Enjoy the sushi!