The boy prefers to travel during summer actually as we can travel lighter and there's more clothes suitable for our own tropical weather on sale there. After our crazy fun-but-tiring trip to 7 Japanese cities last year, I'm quite happy to just stay in Tokyo this time and it's a good thing that Tokyo doesn't get overwhelmingly hot during summer.. unlike Kyoto.
The boy wants to go check out some Japanese CrossFit boxes though and work out there. I might join him for one or two sessions too. It will be cool to see how they conduct it in Japan!