Prime Minister Shinzo Abe declared a state of emergency for Tokyo and six other prefectures, including the neighboring areas of Saitama, Chiba and Kanagawa in response to a surge in COVID-19 infections.

It is NOT a hard lockdown like in Europe; it is expected that the majority of the workers will still be heading to the office tomorrow morning. Public transportation will remain running and roads will stay open.

The declaration is in effect until May 6th, which is the end of the "Golden Week" holiday period.

The government has the authority to call off any events scheduled during this period, and tourist attractions will remain closed.

Basically all tourist attractions that take admission fees are not operating until at least April 12th.

During March, the outdoor gardens such as Shinjuku Gyoen or Hamarikyu had remainded open but they have all shut down.

Updates

March 13- Museums and zoos managed by the Tokyo Government will extend its closure period until March 31st

Studio Ghibli will extend closure through April 28

The Tokyo Skytree announces closure until further notice

March 12 - The Tokyo National Museum and Miraikan will remain closed beyond the 17th, with no reopening dates mentioned.

The Cupnoodle Museum extends its closure to the 31st.

On Feb 26th, the Japanese Government requested for a temporary halt to any large scale sporting/cultural events as part of the effort to minimize the spread of the coronavirus. On March 11th, the government made further announcements to keep the order effective through March 20. As a result, a large number of tourist attractions including Tokyo Disneyland, teamLAB borderless  and various museums have responded by temporarily shutting down operations during the following period:

*Tokyo Disneyland (incl. DisneySea) closed until at least end of March(possibly through early April)

*Tokyo Skytree closed until further notice

*Ghibli Museum closed through April 28

*TeamLab Borderless closed Feb 29-until further notice

*Tokyo National Museum closed until further notice

*Toyosu Market (including the tuna auctions)- visitors not allowed from Feb 29-March 31

*Tokyo Government Office Observation Deck closed Feb 27-Mar 31

*Ueno Zoo closed Feb 29-Mar 31

*Edo-Tokyo Museum closed Feb 29-Mar 31

*Iwasaki-tei Gardens closed Feb 29-Mar 31

*Miraikan Museum of Emerging Science -closed until further notice

*Honda Welcome Plaza Aoyama (including ASIMO demonstrations) closed until further notice

*Sanrio Puroland closed until early April 

*Cupnoodles Museum in Yokohama closed Feb 29-March 31

*The Railway Museum in Saitama closed Feb 29-Mar 31

So what remains open? 

So far the Tokyo Tower, Shinjuku Gyoen National Gardens or the Imperial Palace East Gardens have not announced any closures. The Shibuya Sky observation deck at the Shibuya Scramble Square is still open. The gardens run by the Tokyo Government (Hamarikyu, Koishikawa Korakuen, Rikugien) also remain open with the exception of the Iwasaki-tei Gardens. Temples and shrines such as Sensoji or Meiji Shrine can also be visited, and a majority of restaurants and cafes are doing business as usual.

The NPB has announced its 2020 season will be starting at a later day, although they have not specified when that day will be.

The season was scheduled to start on March 20th, but the government is asking for a limit on huge events amid the coronavirus concerns.

J League soccer officials seem to be targeting April 3rd or 10th as the day their season resumes; games have been suspended since late February and originally were due to resume on March 18th.