[noodle]

Personally i wouldn't go to Japan alone at the age of 16 without having a strong level in japanese! There could be endless numbers of complications due to your age and hotels (which someone already mentioned) is just the start!

If you really wanna go, i suggest that you find at least one adult to go with and/or try to convince your reliable buddy's to go! Even though a group of 16 year olds can have problems, it's a lot more reassuring than just being a single 16 yr old in a country you don't know with a language you don't know!