Now is a good time to stay home and read a good book - AND help your English!
Big bookshops often have books in easy English to help students build vocabulary. It's a relaxing way to improve language skills.
Last week I was in Junkodo in Odori and I found many interesting books. Stories about famous people, Japanese famous characters etc Why not go and buy one?
Always check the back cover to see what English level the book is. Beginner - Intermediate - Advanced. It's a good idea to read slightly above your level.