Tokyo Tower's Main Deck (150m) is currently undergoing renovation work. While work continues, one of the deck's four sides will be closed; the other three sides are still available for use.
The Tokyo Metropolitan Government Building (Tocho) North Observation Deck is currently undergoing renovation work until January 2020. The South Observation Deck is still open.
Mount Hakone and the Owakudani crater area is currently closed, including the Hakone Ropeway. This is due to increased volcanic activity in the area and the risk of an eruption. This closure does not currently affect Lake Ashinoko or other hot spring, but this may change - check the local conditions before visiting.