You must have a valid passport and an onward/return ticket for tourist/business visa free stays of up to 90 days. Your passport must be valid for the entire time you are staying in Japan. You cannot work on a 90-day visa free entry.
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Currently, there are no COVID-19 testing , proof of vaccination, or quarantine requirements to travel to Japan.
So in conclusion, is Japan expensive? Yes, Japan is an expensive country, but can be enjoyed on a moderate budget too. Book your flights well in advance, keep transportation prices down by enjoying unlimited train travel with JR Pass, and book accommodation outside of peak travel times.