Hi,

I liked the lights at Tokyo Mega illumi at Oi racecourse last year ( the laser and water fountain show was a bit poor though) -it was quiet. This year on the website it says the weekends could be busy.
Pre covid I liked tokyo midtown ( the garden lights had occasional mist blown through it) and the buildings surrounding Marunouchi ( 2 of them had star wars related christmas trees)

I will be spending a week in Tokyo in early December ( aim to sightsee round gardens in the morning, then back to the hotel to relax in the pool then go out to see the lights in the evening ( avoiding the metro rush hour if possible)- if the weather is poor then will visit muesums or maybe odaiba

Planning on going to see
Minato Mirai and Red brick warehouses in Yokohama ( 1 night at the Hilton Yokohama)
Caretta Shiodome ( close to the Conrad tokyo where I will be for 5 nights)
Marunouchi /Kitte building/Tokyo Midtown Hibiya
Tokyo Dome City
Shinjuku central park/ JR station south terrace
Omotesando Hills
Tokyo Midtown
Roppongi Hills
Tokyo Disneyland ( 40th anniversary year & christmas)

Maybe make a visit to Shibuya and miyashita park or if anything else catches my eye , will make a detour
From what I can see the Oi racecourse illuminations are dark between 4&8 Dec.

Regards

TBS