There are several places from where you can admire Odaiba and the surroundings, like the observatory from Fuji TV or the Ferris Wheel from the Palette Town. However, the best place to take photos is the observatory from the
Fune no Kagakukan (Museum of Maritime Science).
Looking towards Aqua City, in a clear day, you can see as far as Hinode Pier (the pyramid shaped building) and the
Saint Luke towers.
View from Museum of Maritime Science Observation Deck, Odaiba, Tokyo EXIF info:
Nikon D90
Lens: 18-70mm F/3.5-4.5G
Focal Length: 70mm
Aperture: F/7.1
Shutter Speed: 1/1250s
ISO Sensitivity: ISO 320