You should visit Asakusa ! You must be able to enjoy the traditional town.

Hi, I actually live in Tokyo and have had to plan out an itinerary for over 20 sets of visitors over the last 18 months. So here's my recommended itinerary for first timers. So I suggest:

• 1 day around Ginza / Tsukiji
• 1 day around Ueno / Asakasa / Shinjuku
• 1 day around Roppongi / Omotesando / Meiji-jingu 
• 1 day around Shibuya / Daikanyama

I've also collected a number of my favourite haunts here: https://www.pebblar.com/trip/index/11

For a friendly family, you need to stay at Khaosan World Asakusa RYOKAN & HOSTEL. It's cheap and qualified for parents with kids. Also, you shouldn't miss parks as Ueno park. It's beautiful. Some shopping places as . For kids' entertaiment,  NHK Studio Park is a good choice. You can view my detailed plan with recommeded hotel and where to go with kids here. 

Hi Junwei,

You could head to Disneyland Tokyo. There are two parks there and although it is an expensive day out for a whole family, its a lot of fun and you'll definietly fill up our day.

I also recommend Tokyo Skytower as there is a lot there. Also the Ghibli museum in Tokyo is worth exploring if you and your children like Japanese anime films. If your children like animals then maybe Ueno Zoo.

I have written a blog post on my website about Tokyo and what there is to do, including free things to do! Here is the link: http://bit.ly/1NddNye

I recommend to visit "Edo museum", Roppongi Hills observation or Tokyo sky tree, Shinjuku (the biggest and busiest station), shopping malls around this area, shibuya, Tokyo station, omotesandou&takeshita douri. ... There are lot of nice places!