In & Around:
I took this photo from Daiba Park. It is very close to the fireworks shooting site, so the fireworks are very large. I use a 15mm (on 1.5 crop) trying to get as many fireworks in the flame. Not many people heres.
If you want to see fireworks up close, this island could be one of the closest place you can go. Don't step over the fence during the fireworks show, but after that is OK to do so. Don't slip and fly over the cliff!
Google map doesn't show how to walk there (yet). See image in combination of google map below.