Just a quick but very big thanks to all those TA members who helped me with my questions before heading to Tokyo. Just got back and had an amazing time!
Thanks so much for help with transport / route suggestions and to mamajelli for the girly tips :0)
Tokyo is an amazing place, I don't think I have been anywhere where the locals are so very helpful. I speak no Japanese but got by fine pointing and referring to pics etc. Everyone was so lovely.
Everything is spotless and easier to get around than you might think. I was daunted as a first timer by the transport system at first, but settled into it straight away. There are signs and arrows everywhere, the ticket machines have an English option and maps showing the fare cost to each destination. Even if you do get the wrong ticket by accident, you can adjust your fare in the machine at the end (again an English option).
Tsukiji fish market def worth visit, I did both Nikko and Kamakura and loved them both (although think Nikko had the slight edge for me). Harajuku on a Sunday afternoon is great for photos of everyone in their cos-play outfits. Sibuya, Shinjuku and Ginza are just mind blowingly huge, with such an enomous choice of shops and seriously tall sky scrapers. Akihabara was an experience in itself, watch out for 'Anime' shops where there are signs banning under 18s, you may see more than you bargained for!!
Be prepared at temples etc for groups of school kids, I was photographed interviewed and even videoed by the teachers while they practised their English. Very sweet kids and have some great photos myself that they took for me!
Thanks to all for your hints, tips and suggestions. The destination experts on here really know their stuff and are invaluable. I went feeling a little daunted, but came back with very tired achey feet, tons of photos and a great big smile on my face. Enjoy people!