Itinerary check for Tokyo trip

I really can’t tell if this is too much to do in this # of days, as it’s hard to tell how long travel to/from will take and how long I’ll want to spend at each location. But could I get a general check if this would work or should I move things around? This is only a couple days of our trip btw, so we still have some free days after these to pull things in if it’s too much

Day 4: arriving at Shinagawa Prince in Tokyo by ~3pm
* Check in at hotel
* Shibuya (mainly a shopping day/evening)

Day 5, October 11:
* imperial palace in the morning
* Akihabara mid-afternoon 
* Odaiba at night

Day 6, October 12: 
* Hanazono shrine + Shinjuku gyoen national garden in the AM
* Harajuku + yoyigi Park afternoon/evening